Homework- Biology 2010 Tree thinking exercise Recent analyses of genes called re
ID: 140818 • Letter: H
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Homework- Biology 2010 Tree thinking exercise Recent analyses of genes called retroposons support the hypothesis that there is a monophyletic group of mammals that originated and diversified in Africa. The data that support this conclusion, and the resulting tree, are shown here. The numbers across the top of the table identify different retroposons; the 1s and Os for each species indicate that a particular retroposon is present (1) or absent (0). For each question, choose the single best answer. There are a total of 13 questions. Manatee ,nsect S Tenrec Elephant shrews 1-6 78 9-12 13 Manatee 10 0 10 0 Tenrec Ekphant shrew Question 1. Sister groups (or species) are each others' closest relative-meaning that they share a most-recent common ancestor. For example, manatees and hyrax are sister groups on this tree, and elephant shrews are a sister group to aardvark + tenrec. Based on the data given, when elephants are added to the tree they should be a sister group to D Manatee r Hyrax Manatee+ hyrax Aardvark Tenrec Aardvark + tenrec Elephant shrew Aardvark + tenrec + elephant shrew Everyone (manatee + hyrax + aardvark + tenrec + elephant shrew)Explanation / Answer
Ans1)Manatee and hyrax because they share common retroposons with elephant.
Ans2)1-6,because these retropons are present in every species.
Ans3)Advard,tenrec and elephant shrew
Ans4)Homoplasy-whales are not closely related to manatees,similarities evolved independently in both.
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