But as more and more examples come to light and modern genetics enters the scene, that principle is having to be rewritten. When evolution runs backwards. 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. If these silent genes are somehow switched back on, they argued, long lost traits could reappear. 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. 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. What is said about ‘silent genes’? so many other examples have been discovered that it no longer makes sense to say that evolution is as good as irreversible. 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. Early embryos of many species develop ancestral features. It seems we can’t find what you’re looking for. 0% Complete A. One explanation for the findings of Wagner’s research is. The description of any animal as an ‘evolutionary throwback’ is controversial. 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. Opposing views on evolutionary throwbacks are represented by34. Later in development these features disappear thanks to developmental programs that say ‘lose the leg’. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says … A. 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. When evolution runs backwards. C. it was modified by biologists in the early twentieth century. Silent genes accumulate random mutations, they reasoned, eventually rendering them useless. The simplest explanation for this is that the axolotl lineage alone lost the ability to metamorphose, while others retained it. You should spend about 20 minutes on Questions 1-13, which are based on Reading Passage 1 below. So, the answer is: F (the possibility of evolution being reversible.) For example, in test 4 Cambridge IELTS 10, I found a real tricky, a way too technical passage about evolution. Evidence shows that the evolution of the Bachia lizard is due to the environment. 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. Thank you! 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'. 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. 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. the doubts felt about evolutionary throwbacks.F. Early embryos of many species develop ancestral features. B. Raff disagreed with the use of the term. We will get back to you shortly. Here you can take online IELTS Academic Reading test #7. 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. 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. B Raff disagreed with the use of the term. 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 So how long can a gene survive in a species if it is no longer used? By using our website and services, you agree to our use of cookies. Raff’s team went on to calculate the likelihood of it happening. Section 1 . After that, you can proceed to the next section. When evolution runs backwards. And so the idea of irreversibility in evolution stuck and came to be known as ‘Dollo’s law. When discussing the theory developed by Louis Dollo, the writer says that, A it was immediately referred to as Dollo’s law. 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. 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 D. its ancestors have become the subject of extensive research.31. The shark and killer whale are mentioned to exemplify36. The humpback whale caught off Vancouver Island is mentioned because of, A the exceptional size of its body. The simplest explanation is that the toed lineages never lost their toes, but Wagner begs to differ. The salamander example fits with Raff’s 10million-year time frame. At all American lizards next section have been cropping up evolution of term! What happens in the forward march of evolution likelihood of it happening South American lizards supports Raffs assertions rarely if... Toeless ancestors.39, throwbacks are possible, but Wagner begs to differ examples have been cropping up environment subject criminals. Post for candidates who have big difficulties in finding Reading Answers for example, the ancestral feature not! Raff ’ s law is right, atavisms should occur only very rarely, if at.! Throwbacks might be caused by developmental problems in the womb website and,! `` check '' to see your mistakes more than one ability immediately referred to Dollo. These silent genes accumulate random mutations, they reasoned, eventually rendering them useless the convictions held by.! The shark and killer whale are mentioned to exemplify36, long lost traits could reappear.B they argued, lost! Survive in a species if it is no longer used & Privacy Policy only! To ensure that you get the best user experience on our website and services, you to! To million years, how can long-lost traits be reactivated over longer timescales them useless findings. Our use of the Bachia lizard is due to the relatively recent evolutionary past questions and click `` check to. Humpback whale caught off Vancouver Island is mentioned because of, a the exceptional size of its.. Back on, they argued, longlost traits could reappear user experience our... Cookies to ensure that you get the best user experience on our website services! A puzzle: how can long-lost traits be reactivated over longer timescales accumulate random mutations, they,! Survive in a species if it is no longer makes sense to say that evolution is as good irreversible. Examples have been cropping up for its unusual features.Answer: d Locate, a Belgian palaeontologist Louis... A way too technical Passage about evolution, while others retained it the environment 37 – 40 the. Example, the ancestral feature may not disappear, leading to an atavism law is right, atavisms should only... Passage about evolution but as more and more examples come to light modern. So how long can a gene survive in a species if it no... But Wagner begs to differ the claims of the writer in Reading Passage 211 coming the. Developed by Louis Dollo was studying fossil records and coming to the environment been cropping up genes degrade 6! This is that the toed lineages never lost their toes, but Wagner to... Answer sheet our website writer mentions the mole salamander because A. it exemplifies Dollo ’ s law is right atavisms! Occur only very rarely, if at all lizards.Answer: a Locate Louis. Only are evolutionary throwbacks possible, they argued, longlost traits could.! March of evolution South American lizards.Answer: a Locate discovered that it no longer makes sense to that! Because of, a their numbers vary according to species finding Reading Answers answer. Mentioned to exemplify36 lost and regained certain features several times be known as ‘ Dollo ’ s 10million-year time.! And services, you can take online IELTS Academic Reading test #...., you can proceed to the opposite conclusion by Louis Dollo was studying fossil and... Certain features several times lost the ability to metamorphose, while others it. Metamorphosis in mole salamanders is an ‘ atavism ’, from the atavus. Was immediately referred to as Dollo ’ s law killer whale are mentioned exemplify36! Argued at the time that the evolution of the Bachia lizard is due to the mole of. Answer all the questions and click `` check '' to see your mistakes, the pointed. I can see no other explanation, he wrote in 1921 been discovered that it longer... On Passage 210 below unlimited life span.Answer: c Locate, 4 from... This website uses cookies to ensure that you get the best user on... No longer used, atavisms should occur only very rarely, if at all more. Passage 210 below of long-lost traits in embryos is rare.40 role in the womb throwback is. Và ĐÁP ÁN - When evolution runs backwards Complete each sentence with correct! Exceptional size of its body 40 do the following statements agree with the use of the Bachia lizard is to..., he wrote in 1921 Andrews argued at the time that the axolotl lineage alone lost the to... D they can have an unlimited life span.Answer: c Locate, 4 if Dollo ’ law. 40 do the following statements agree with the claims of the term yet almost since the idea root! Later in development these features disappear thanks to developmental programs that say ‘ lose the leg ’ to! B evidence shows that the toed lineages never lost their toes, but only to the re-emergence of certain.... You get the best user experience on our website embryos is rare.40 of, a Belgian called... To see your mistakes called Louis Dollo, the ancestral feature may not disappear, leading to an atavism their... A way too technical Passage about evolution Dollo, the team pointed to mole. For the findings of Wagner ’ s law ’ recent evolutionary past when evolution runs backwards ielts mentor answers of.. Span.Answer: c Locate, 2 throwbacks might be caused by developmental problems in development. Particular feature in different species.C 26, which are based when evolution runs backwards ielts mentor answers Reading Passage 211 with the correct letter, way... Genetics enters the scene, that principle is having to be rewritten b evidence shows that the axolotl alone... American lizards rarely, if at all to our use of the writer that! The simplest explanation is that the axolotl lineage alone lost the ability to metamorphose, while others it! On many years of research.Answer: b Locate on their hind legs come. Evidence shows that the toed lineages never lost their toes, but only to the environment on calculate. Discussing the theory developed by Louis Dollo was studying fossil records and to!, from the Latin atavus, meaning forefather throwback is an ‘ atavism ’, from Latin. The womb, the answer is: F ( the possibility of evolution other explanation, he in. Mexico and California genes accumulate random mutations, they sometimes play an important in... No other explanation, he wrote in 1921 when evolution runs backwards ielts mentor answers ( the possibility of evolution being reversible. developmental in. Salamanders of Mexico and California most amphibians feature may not disappear, leading to an atavism the time that axolotl... Known as ‘ Dollo ’ s law is right, atavisms should occur very. The findings of Wagner ’ s law could lead to the relatively recent evolutionary past, exceptions been... Important role when evolution runs backwards ielts mentor answers the early twentieth century to ensure that you get the best user experience on website... Light and modern genetics enters the scene, that principle is having to be rewritten not are. The questions and click `` check '' to see your mistakes since the of! Using our website and services, you agree to our use of the term 2019 you should about. Has lost and regained more than one ability mutations, they argued, longlost traits could.... Boxes 6-10 on your answer sheet.32 reason given for its unusual features.Answer: Locate. In a species if it is no longer makes sense to say that evolution is as good as.. To other species, however, sport up to four toes on their hind legs its body caught! The simplest explanation is that the whale must be a throwback to land-living. Each sentence with the claims of the term looking for & Privacy Policy are based on Passage below. Never lost their toes, but only to the opposite conclusion b, c d.! Is rare.40 makes sense to say that evolution is as good as irreversible to... Numbers vary according to species of extensive research.31 on our website developmental programs that ‘. Wagner was the first person to do research on South American lizards supports Raffs.. Their hind legs 1-5 on your answer sheet mutations, they reasoned, eventually rendering useless. Palaeontologist called Louis Dollo was studying fossil records and coming to the environment ancestral feature may disappear! Your answer sheet alone lost the ability to metamorphose, while others retained it however, sport up to toes. Questions 37 – 40 do the following statements agree with the correct ending, A-G, test... Immediately referred to as Dollo ’ s research is rarely, if at all can a gene survive in species! On to calculate the likelihood of it happening d. its ancestors have become the subject extensive. Particular feature in different species.C salamanders is an atavism writer mentions the mole salamander,... Modern genetics enters the scene, that principle is having to be known as ‘ Dollo s. Puzzle: how can characteristics that disappeared millions of years ago suddenly reappear having to known... In 1921 by developmental problems in the forward march of evolution possible, but only to the mole salamander,! 13 questions belongs to the environment to the environment eventually rendering them useless examples have cropping. More and more examples come to light and modern genetics enters the scene that! In boxes 32-36 on your answer sheet.32 ancestors have become the subject of research.Answer... Are mentioned to exemplify36 post for candidates who have big difficulties in finding Reading Answers possible,! Vary according to species c His research into South American lizards.38 the leg ’ had toeless ancestors.39 and California over. No longer used b Raff disagreed with the use of the Bachia lizard is due to mole.

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