Extensive research has been done to find similarities and


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Extensive research has been done to find similarities and differences in the DNA sequences of different animals.This work is very diffi cult and time consuming, but it can help biologists determine the evolutionaryancestry of a species. For example, when investigating the human genome, biologists found that about99.5% of the DNA sequences among humans are the same. Considering the wide variety of traits in thehuman population, we are a lot more similar than we are different. Humans share approximately 96% oftheir DNA sequences with chimpanzees, 85% with mice, and 75% with chickens. Study the table below.Organism Pair Percentage of DNA Similarity A – B 97 A – C 85 A – D 50 a. To which organism, B, C or D, is organism A most closely related? Support your answer. b. Which pair of organisms in the table is least closely related? Support your answer. c. Which pair of organisms most likely shares a recent common ancestor? Support your answer.Evidence for Evolution 2.Suppose another organism, organism X, is discovered. Suggest how scientists would use DNAcomparison to classify organism X?

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