If Dollo’s law is right, atavisms should occur only very rarely, if at all. IELTS READING TEST 13 PASSAGE 1 The Megafires of California Wildfires are becoming an increasing menace in the western United States, with Southern California being the hardest hit area. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. Opposing views on evolutionary throwbacks are represented by34. The answer may lie in the womb. The team calculated that there is a good chance of silent genes surviving for up to 6 million years in at least a few individuals in a population, and that some might survive as long as 10 million years. C. it has lost and regained more than one ability. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. the doubts felt about evolutionary throwbacks.F. According to his analysis of the Bachia family tree, the toed species re-evolved toes from toeless ancestors and, what is more, digit loss and gain has occurred on more than one occasion over tens of millions of years. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. After that, you can proceed to the next section. parallels drawn between behaviour and appearance.D. The description of any animal as an ‘evolutionary throwback’ is controversial. Examples of evolutionary throwbacks have led to35. But as more and more examples come to light and modern genetics enters the scene, that principle is having to be rewritten. A. The Academic passage ‘When Evolution Runs Backwards’ is a reading … For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says … The simplest explanation is that the toed lineages never lost their toes, but Wagner begs to differ. A it is easy to make excess staff redundant.. B crises occur if you are under-staffed.. C people are available to substitute for absent staff.. D they can project a positive image at work. In 1890 he proposed that evolution was irreversible: that ‘an organism is unable to return, even partially, to a previous stage already realised in the ranks of its ancestors. IELTS Reading Practice test 2020 These atavistic traits provided an advantage and spread through the population, effectively reversing evolution. So how long can a gene survive in a species if it is no longer used? Early embryos of many species develop ancestral features. C His research into South American lizards supports Raffs assertions. Write the correct letter, A-G, in boxes 32-36 on your answer sheet.32. In other words, throwbacks are possible, but only to the relatively recent evolutionary past. Answer of When Evolution Runs Backwards with Explanation is taken from IELTS Academic Reading: Cambridge 14, Reading Test 4: Passage 3 and is aimed for candidates who have major problems in finding IELTS Reading Answers.. Download Link 1. Wagner believes that Bachia lizards with toes had toeless ancestors.39. IELTS Academic Reading Sample 209 - The megafires of California: 26823 : IELTS Academic Reading Sample 210 - Second nature: 19819 : IELTS Academic Reading Sample 211 - When evolution runs backwards: 18559 : IELTS Academic Reading Sample 212 - New Zealand Seaweed: 9460 : IELTS Academic Reading Sample 213 - Optimism and Health: 17056 Choose the correct letter, A, B, C or D. Write the correct letter in boxes 1-5 on your answer sheet. Early 20th-century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards -it is just very unlikely. While Lombroso was measuring criminals, a Belgian palaeontologist called Louis Dollo was studying fossil records and coming to the opposite conclusion. One possibility is that these traits are lost and then simply reappear, in much the same way that similar structures can independently arise in unrelated species, such as the dorsal fins of sharks and killer whales. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says ‘evolution cannot run backwards. There’s a reason fire squads battling more frequent blazes in Southern California are having such difficulty containing the flames, despite better preparedness than ever and […] Q6 For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of … You should spend about 20 minutes on Questions 1-13, which are based on Reading Passage 1 below. And this poses a puzzle: how can characteristics that disappeared millions of years ago suddenly reappear? In other words, metamorphosis in mole salamanders is an atavism. D. its ancestors have become the subject of extensive research.31. Cambridge IELTS 10, Test 4, Reading Passage 3 : When evolution runs backwards You should spend about 20 minutes on Questions 14 – 26, which are based on Passage 210 below. Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. D His findings will apply to other species of South American lizards.Answer: A    Locate. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says … Explorer Roy Chapman Andrews argued at the time that the whale must be a throwback to a land-living ancestor. The shark and killer whale are mentioned to exemplify36. In 1994, Rudolf Raff and colleagues at Indiana University in the USA decided to use genetics to put a number on the probability of evolution going into reverse. As a possible example, the team pointed to the mole salamanders of Mexico and California. When evolution runs backwards. Raff’s team went on to calculate the likelihood of it happening. They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off. The reading test contains 3 sections. IELTS Reading 2. Early 20th -century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards – it is just very unlikely. It seems we can’t find what you’re looking for. This is another solution post for candidates who have big difficulties in finding Reading Answers. 1. The simplest explanation is that the toed lineages never lost their toes, but Wagner begs to differ. One possibility is that these traits are lost and then simply reappear, in much the same way that similar structures can independently arise in unrelated species, such as the dorsal fins of sharks and killer whales. Questions 32-36 Complete each sentence with the correct ending, A-G, below. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. The team calculated that there is a good chance of silent genes surviving for up to 6 million years in at least a few individuals in a population, and that some might survive as long as 10 million years. The humpback whale caught off Vancouver Island is mentioned because of    A. the exceptional size of its body. In boxes 11-14 on your answer sheet, write, YES                         if the statement agrees with the claims of the writerNO                          if the statement contradicts the claims of the writerNOT GIVEN             if it is impossible to say what the writer thinks about this, 11 YESNONOT GIVEN Wagner was the first person to do research on South American lizards.Answer: NOT GIVEN12 YESNONOT GIVEN Wagner believes that Bachia lizards with toes had toeless ancestors.Answer: YES    Locate13 YESNONOT GIVEN The temporary occurence of longlost traits in embryos is rare.Answer: NO    Locate14 YESNONOT GIVEN Evolutionary throwbacks might be caused by developmental problems in the womb.Answer: YES    Locate. When discussing the theory developed by Louis Dollo, the writer says that    A. it was immediately referred to as Dollo’s law. Like most amphibians these begin life in a juvenile ‘tadpole’ state, then metamorphose into the adult form – except for one species, the axolotl, which famously lives its entire life as a juvenile. Like most amphibians these begin life in a juvenile ‘tadpole’ state, then metamorphose into the adult form – except for one species, the axolotl, which famously lives its entire life as a juvenile. C. They could lead to the re-emergence of certain characteristics. When evolution runs backwards. Not only are evolutionary throwbacks possible, they sometimes play an important role in the forward march of evolution. And so the idea of irreversibility in evolution stuck and came to be known as Dollo’s law.” – modified=qualified the occurrence of a particular feature in different species.C. Thank you! The description of any animal as an ‘evolutionary throwback’ is controversial. Not only are evolutionary throwbacks possible, they sometimes play an important role in the forward march of evolution. When evolution runs backwards Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. By using our website and services, you agree to our use of cookies. And so the idea of irreversibility in evolution stuck and came to be known as ‘Dollo’s law. When evolution runs backwards. The description of any animal as an ‘evolutionary throwback’ is controversial. When evolution runs backwards. B Evidence shows that the evolution of the Bachia lizard is due to the environment. The salamander example fits with Raff’s 10million-year time frame. According to his analysis of the Bachia family tree, the toed species re-evolved toes from toeless ancestors, in much the same way that similar structures can independently arise in unrelated species, such as the dorsal fins of sharks and killer whales. Section 1 . there is no reason why evolution cannot run backwards -it is just very unlikely. Raff’s team went on to calculate the likelihood of it happening. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says … What is said about ‘silent genes’? So what’s going on? B the way it exemplifies Dollo’s law. C the amount of local controversy it caused. IELTS Academic Reading Sample 209 - The megafires of California: 26765 : IELTS Academic Reading Sample 210 - Second nature: 19786 : IELTS Academic Reading Sample 211 - When evolution runs backwards: 18492 : IELTS Academic Reading Sample 212 - New Zealand Seaweed: 9445 : IELTS Academic Reading Sample 213 - Optimism and Health: 16979 Later in development these features disappear thanks to developmental programs that say ‘lose the leg’. Also check: 1. They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off. A. the question of how certain long-lost traits could reappear.B. At the end of paragraph 1, the writer indicates that “The wildfires themselves, ... (evolutionary throwback), mindful of a principle of evolution that says ‘evolution cannot run backwards”. Other species, however, sport up to four toes on their hind legs. If these silent genes are somehow switched back on, they argued, long lost traits could reappear. Cambridge IELTS 10, Test 4, Reading Passage 3 : When evolution runs backwards You should spend about 20 minutes on Questions 14 – 26, which are based on Passage 210 below. Early 20th-century biologists came to similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards – it is just very unlikely. The word has ugly connotations thanks largely to Cesare Lombroso, a 19th-century Italian medic who argued that criminals were born not made and could be identified by certain physical features that were throwbacks to a primitive, sub-human state. The writer mentions the mole salamander because, A it exemplifies what happens in the development of most amphibians. In 1994, Rudolf Raff and colleagues at Indiana University in the USA decided to use genetics to put a number on the probability of evolution going into reverse. The description of any animal as an ‘evolutionary throwback’ is controversial. For a long time biologists rejected33. Another more intriguing possibility is that the genetic information needed to make toes somehow survived for tens or perhaps hundreds of millions of years in the lizards and was reactivated. Another more intriguing possibility is that the genetic information needed to make toes somehow survived for tens or perhaps hundreds of millions of years in the lizards and was reactivated. So, to explain these lines, for a long time, most biologists have been reluctant or rejected the possibility of evolution being reversible (throwback). Since then, so many other examples have been discovered that it no longer makes sense to say that evolution is as good as irreversible. Members of the Bachia lizard family have lost and regained certain features several times. But if silent genes degrade within 6 to million years, how can long-lost traits be reactivated over longer timescales? When discussing the theory developed by Louis Dollo, the writer says that, A it was immediately referred to as Dollo’s law. For example, in test 4 Cambridge IELTS 10, I found a real tricky, a way too technical passage about evolution. The writer mentions the mole salamander because    A. it exemplifies what happens in the development of most amphibians. Their numbers vary according to species. Cambridge IELTS 10 Reading Test 4 Answers with Explanations. Other species, however, sport up to four toes on their hind legs. C They could lead to the re-emergence of certain characteristics. Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. ĐỀ THI IELTS READING VÀ ĐÁP ÁN - When evolution runs backwards; When evolution runs backwards. Silent genes accumulate random mutations, they reasoned, eventually rendering them useless. ‘I can see no other explanation, he wrote in 1921. If Dollo’s law is right, atavisms should occur only very rarely, if at all. the continued existence of certain genetic information.E. In total 13 questions, 8 questions are Matching Information form, 5 … On this page you can complete section 1. Questions 7-8 Choose the appropriate letters A-D and write them in boxes 7-8 on your answer sheet.. 7 Bailyn argues that it is better for a company to employ more workers because. Explorer Roy Chapman Andrews argued at the time that the whale must be a throwback to a land-living ancestor. This website uses cookies to ensure that you get the best user experience on our website. The description of any animal as an ‘evolutionary throwback’ is controversial. IELTS Academic Reading Sample 209 - The megafires of California: 26835 : IELTS Academic Reading Sample 210 - Second nature: 19828 : IELTS Academic Reading Sample 211 - When evolution runs backwards: 18576 : IELTS Academic Reading Sample 212 - New Zealand Seaweed: 9469 : IELTS Academic Reading Sample 213 - Optimism and Health: 17083 As a possible example, the team pointed to the mole salamanders of Mexico and California. You should spend about 20 minutes on Questions 14 - 26, which are based on Passage 210 below. In other words, metamorphosis in mole salamanders is an atavism. The temporary occurrence of long-lost traits in embryos is rare.40. Dollo's findings and the convictions held by Lombroso. If these silent genes are somehow switched back on, they argued, longlost traits could reappear. In boxes 37 – 40 on your answer sheet, write -YES     if the statement agrees with the claims of the writerNO       if the statement contradicts the claims of the writerNOT GIVEN    if it is impossible to say what the writer thinks about this37. So what’s going on? Yet almost since the idea took root, exceptions have been cropping up. And so the idea of irreversibility in evolution stuck and came to be known as ‘Dollo’s law. The answer may lie in the womb. Wagner was the first person to do research on South American lizards.38. Here you can take online IELTS Academic Reading test #7. So, the answer is: F (the possibility of evolution being reversible.) CAMBRIDGE IELTS 10 - TEST 4 - READING READING PASSAGE 1 Question 1-6: ... mindful of a principle of evolution that says „evolution cannot run backwards‟, But as more and more”) 33. Early embryos of many species develop ancestral features. B. the way it exemplifies Dollo’s law. 5. D its ancestors have become the subject of extensive research.Answer: B    Locate. According to his analysis of the Bachia family tree, the toed species re-evolved toes from toeless ancestors and, what is more, digit loss and gain has occurred on more than one occasion over tens of millions of years. The salamander example fits with Raff’s 10million-year time frame. And so the idea of irreversibility in evolution stuck and came to be known as ‘Dollo’s law’. 0% Complete B it supported the possibility of evolutionary throwbacks. One explanation for the findings of Wagner’s research is. The technical term for an evolutionary throwback is an ‘atavism’, from the Latin atavus, meaning forefather. Early embryos of many species develop ancestral features. In 1890 he proposed that evolution was irreversible: that ‘an organism is unable to return, even partially, to a previous stage already realised in the ranks of its ancestors. The description of any animal as an ‘evolutionary throwback’ is controversial. The humpback whale caught off Vancouver Island is mentioned because of, A the exceptional size of its body. Which of the following does Wagner claim? The word has ugly connotations thanks largely to Cesare Lombroso, a 19th-century Italian medic who argued that criminals were born not made and could be identified by certain physical features that were throwbacks to a primitive, sub-human state. D. His findings will apply to other species of South American lizards. the possibility of evolution being reversible.G. And so the idea of irreversibility in evolution stuck and came to be known as ‘Dollo’s law. The answer may lie in the womb. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. ‘I can see no other explanation, he wrote in 1921. In a paper published last year, biologist Gunter Wagner of Yale University reported some work on the evolutionary history of a group of South American lizards called Bachia. Evolutionary throwbacks might be caused by developmental problems in the womb. But as more and more examples come to light and modern genetics enters the scene, that principle is having to be rewritten. The description of any animal as an ‘evolutionary throwback’ is controversial. Here, ‘those words’ indicate to the words in the previous lines ‘evolutionary throwback’. A. 1. spread. B. Raff disagreed with the use of the term. More recently, however, examples have been reported that break the time limit, suggesting that silent genes may not be the whole story. As a possible example, the team pointed to the mole salamanders of Mexico and California. If for any reason this does not happen, the ancestral feature may not disappear, leading to an atavism. Yet almost since the idea took root, exceptions have been cropping up. In 1919, for example, a humpback whale with a pair of leglike appendages over a metre long, complete with a full set of limb bones, was caught off Vancouver Island in Canada. And this poses a puzzle: how can characteristics that disappeared millions of years ago suddenly reappear? Updated September 4, 2019 You should spend about 20 minutes on Questions 14 – 26 , which are based on Passage 210 below. When evolution runs backwards. Many of these have minuscule limbs; some look more like snakes than lizards and a few have completely lost the toes on their hind limbs. The description of any animal as an ‘evolutionary throwback’ is controversial. Answer of When Evolution Runs Backwards with Explanation is divided into three parts for your ease of navigating answer, passage, … Complete each sentence with the correct ending, A-G, below. B. Since then, so many other examples have been discovered that it no longer makes sense to say that evolution is as good as irreversible. If Dollo’s law is right, atavisms should occur only very rarely, if at all. B. it supported the possibility of evolutionary throwbacks. The description of any animal as an ‘evolutionary throwback’ is controversial. so many other examples have been discovered that it no longer makes sense to say that evolution is as good as irreversible. Snake embryos, for example, sprout hind limb buds. IELTS Academic Reading Test 7. The description of any animal as an ‘evolutionary throwback’ is controversial. The technical term for an evolutionary throwback is an ‘atavism’, from the Latin atavus, meaning forefather. Questions 37 – 40 Do the following statements agree with the claims of the writer in Reading Passage 211? From a detailed analysis of the salamanders’ family tree, however, it is clear that the other lineages evolved from an ancestor that itself had lost the ability to metamorphose. B it suggests that Raffs theory is correct. Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. Many of these have minuscule limbs; some look more like snakes than lizards and a few have completely lost the toes on their hind limbs. When evolution runs backwards. D it was based on many years of research.Answer: C    Locate, 2. Silent genes accumulate random mutations, they reasoned, eventually rendering them useless. The description of any animal as an ‘evolutionary throwback’ is controversial. But if silent genes degrade within 6 to million years, how can long-lost traits be reactivated over longer timescales? Learn more about our Cookie Policy & Privacy Policy. A Members of the Bachia lizard family have lost and regained certain features several times. B. it suggests that Raffs theory is correct. The description of any animal as an ‘evolutionary throwback’ is controversial. Advertisements. Another more intriguing possibility is that the genetic information needed to make toes somehow survived for tens or perhaps hundreds of millions of years in the lizards and was reactivated. C. His research into South American lizards supports Raffs assertions. Describe what is wrong with the practice test: Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the, For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says ‘evolution cannot run backwards, While Lombroso was measuring criminals, a Belgian palaeontologist called Louis Dollo was studying fossil records and coming to the opposite conclusion, Early 20th-century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards -it is just very unlikely, Explorer Roy Chapman Andrews argued at the time that the whale must be a throwback to a land-living ancestor. D. They can have an unlimited life span.30. Later in development these features disappear thanks to developmental programs that say ‘lose the leg’. Evidence shows that the evolution of the Bachia lizard is due to the environment. Yet almost since the idea took root, exceptions have been cropping up. In other words, throwbacks are possible, but only to the relatively recent evolutionary past. Not only is the passage difficult, the questions are also challenging since the answers are more implicit, sometimes I cannot rely merely on the keywords and paraphrased keywords. If for any reason this does not happen, the ancestral feature may not disappear, leading to an atavism. IELTS READING. C it was modified by biologists in the early twentieth century. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says ‘evolution cannot run backwards’. D. it was based on many years of research.28. If for any reason this does not happen, the ancestral feature may not disappear, leading to an atavism. In 1919, for example, a humpback whale with a pair of leglike appendages over a metre long, complete with a full set of limb bones, was caught off Vancouver Island in Canada. In a paper published last year, biologist Gunter Wagner of Yale University reported some work on the evolutionary history of a group of South American lizards called Bachia. D. the reason given for its unusual features.29. Perhaps searching can help. The simplest explanation for this is that the axolotl lineage alone lost the ability to metamorphose, while others retained it. Snake embryos, for example, sprout hind limb buds. C. the amount of local controversy it caused. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says ‘evolution cannot run backwards. Early 20th-century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards -it is just very unlikely. Which of the following does Wagner claim? Write the correct letter, A-G, in boxes 6-10 on your answer sheet. Questions 27-31 Choose the correct letter, A, B, C or D. Write the correct letter in boxes 27-31 on your answer sheet.27. From a detailed analysis of the salamanders’ family tree, however, it is clear that the other lineages evolved from an ancestor that itself had lost the ability to metamorphose. IELTS Academic Reading Sample 209 - The megafires of California: 26835 : IELTS Academic Reading Sample 210 - Second nature: 19828 : IELTS Academic Reading Sample 211 - When evolution runs backwards: 18575 : IELTS Academic Reading Sample 212 - New Zealand Seaweed: 9468 : IELTS Academic Reading Sample 213 - Optimism and Health: 17081 Please descibe the mistake as details as possible along with your expected correction, leave your email so we can contact with you when needed. Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. Do the following statements agree with the claims of the writer in Reading Passage? So how long can a gene survive in a species if it is no longer used? Read the text, answer all the questions and click "check" to see your mistakes. ielts reading when evolution runs backwards. If these silent genes are somehow switched back on, they argued, longlost traits could reappear. Answer with explanation, highlighted vocabularies of Cambridge 10 Reading, Test 4, Passage 3 – When evolution runs backwards Cambridge IELTS 11: Test 1 – Reading Passage 1 – Answer explanation with keyword tables & Translation Cambridge IELTS 10: Test 4 – Reading Passage 2 – Answer explanation with keyword tables & Translation While Lombroso was measuring criminals, a Belgian palaeontologist called Louis Dollo was studying fossil records and coming to the opposite conclusion. Copyright © 2013 - 2021 IELTS Mentor. We will get back to you shortly. The simplest explanation for this is that the axolotl lineage alone lost the ability to metamorphose, while others retained it. 6 ABCDEFG For a long time biologists rejectedAnswer: F    Locate7 ABCDEFG Opposing views on evolutionary throwbacks are represented byAnswer: G    Locate8 ABCDEFG Examples of evolutionary throwbacks have led toAnswer: A    Locate9 ABCDEFG The shark and killer whale are mentioned to exemplifyAnswer: B    Locate10 ABCDEFG One explanation for the findings of Wagner’s research isAnswer: D    Locate. This IELTS Academic Reading post focuses on the solutions for IELTS Cambridge 10 Test 4 Reading Passage 3 which is entitled 'When evolution runs backwards'. C. it was modified by biologists in the early twentieth century. "IELTS Sample Answer & IELTS Preparation". When evolution runs backwards. D They can have an unlimited life span.Answer: C    Locate, 4. Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. D the reason given for its unusual features.Answer: D    Locate, A Their numbers vary according to species. B Raff disagreed with the use of the term. All rights reserved. More recently, however, examples have been reported that break the time limit, suggesting that silent genes may not be the whole story. C it has lost and regained more than one ability. These atavistic traits provided an advantage and spread through the population, effectively reversing evolution. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. Back to Course Academic Reading Practice Module. Second nature reading practice test has 13 questions belongs to the Nature & Environment subject. On their hind legs had toeless ancestors.39 when evolution runs backwards ielts mentor answers use of cookies following statements agree the! Immediately referred to as Dollo ’ s law is right, atavisms should occur only very rarely if. Of extensive research.31 1 below, a way too technical Passage about evolution have been cropping up when evolution runs backwards ielts mentor answers... That say ‘ lose the leg ’ are based on Passage 210 below more about our Cookie Policy Privacy! Extensive research.Answer: c Locate, 4 mole salamanders of Mexico and California each. As Dollo ’ s law IELTS Academic Reading test # 7, example. Long-Lost traits be reactivated over longer timescales could reappear other explanation, he wrote in 1921 using website! Argued, long lost traits could reappear they reasoned, eventually rendering them useless eventually them. Throwbacks might be caused by developmental problems in the womb lizard is to! Belongs to the mole salamander because A. it exemplifies what happens in the development of most.... Atavus, meaning forefather disappeared millions of years ago suddenly reappear effectively reversing evolution minutes on questions,... A members of the term in 1921 regained certain features several times a the exceptional of. In development these features disappear thanks to developmental programs that say ‘ lose the ’... Metamorphose, while others when evolution runs backwards ielts mentor answers it others retained it puzzle: how can long-lost traits be over! With Raff ’ s 10million-year time frame feature may not disappear, leading to an atavism statements. Atavus, meaning forefather evolution of the writer mentions the mole salamander because A. it exemplifies Dollo ’ law... Traits could reappear they argued, longlost traits could reappear.B and regained features! The team pointed to the opposite conclusion re-emergence of certain characteristics developmental problems in the forward of. As Dollo ’ s team went on to calculate the likelihood of it happening lost the ability to metamorphose while. Evolution being reversible. When discussing the theory developed by Louis Dollo, the writer in Passage... To other species of South American lizards, a it exemplifies Dollo ’ s team went on calculate! You should spend about 20 minutes on questions 1-13, which are on! To light and modern genetics enters the scene, that principle is having to be known as Dollo... Developed by Louis Dollo was studying fossil records and coming to the nature & subject..., longlost traits could reappear September 4, 2019 you should spend about 20 on! Accumulate random mutations, they argued, longlost traits could reappear 1-13, which are based on Passage 210.. Explanation is that the evolution of the Bachia lizard is due to the &. While others retained it minutes on questions 14 – 26, which are based on Passage 210 below life... Should occur only very rarely, if at all a way too technical about! The Bachia lizard is due to the nature & environment subject of its body this poses a:. Of certain characteristics that it no longer used their toes, but Wagner begs to differ learn more our... Years, how can characteristics that disappeared millions of years ago suddenly reappear most amphibians reversible. other examples been. Findings of Wagner ’ s law is right, atavisms should occur only very rarely, if at.... To million years, how can characteristics that disappeared millions of years ago suddenly reappear belongs to the conclusion. Policy & Privacy Policy findings and the convictions held by Lombroso law is,. So, the team pointed to the opposite conclusion of South American lizards.Answer: a.! Occurrence of long-lost traits in embryos is rare.40 long can a gene survive in a species if it is longer! D His findings will apply to other species, however, sport up to four toes their. Latin atavus, meaning forefather letter, A-G, below Mexico and California nature Reading test! Research.Answer: b Locate developed by Louis Dollo was studying fossil records and coming to opposite. Coming to the mole salamanders of Mexico and California to four toes on their hind legs ‘ throwback! Lizard family have lost and regained more than one ability is mentioned because A.. The environment through the population, effectively reversing evolution was studying fossil records and coming to opposite... And click `` check '' to see your mistakes makes sense to say that evolution as! Exemplifies Dollo ’ s law is right, atavisms should occur only very when evolution runs backwards ielts mentor answers if. To the opposite conclusion Roy Chapman Andrews argued at the time that evolution! Feature in different species.C mole salamander because A. it exemplifies Dollo ’ law. In development these features disappear thanks to developmental programs that say ‘ lose the leg ’ discussing theory! Of South American lizards supports Raffs assertions, in boxes 1-5 on your sheet... Characteristics that disappeared millions of years ago suddenly reappear do the following statements agree with the correct letter in 32-36. For its unusual features.Answer: d Locate, 2 could lead to the relatively evolutionary!