Chimpanzees Exhibit 99% Genetic Similarity to Humans

question 42

Multiple Choice

Chimpanzees exhibit 99% genetic similarity to humans.Cows share approximately 80% of their DNA sequence with humans.Scientists can predict the relative age of a common ancestor using DNA sequences.Which of the following statements regarding molecular clocks is true?

• A) Molecular clocks cannot provide information regarding the relatedness of organisms or how distantly related common ancestors are from descendant species.
• B) The common ancestor of cows,chimpanzees,and humans lived more recently than the common ancestor of chimpanzees and humans.
• C) Chimpanzees,humans,and cows were at one time more closely related,but due to genetic drift have become more distantly related from one another.
• D) The common ancestor of chimpanzees and humans lived more recently than the common ancestor of cows,chimpanzees,and humans.
• E) Cows do not share a common ancestor with chimpanzees and humans,and any genetic relatedness is by chance.

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