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Humans and Chimpanzees Diverged About 6 Million Years Ago

Question 205

Multiple Choice

Humans and chimpanzees diverged about 6 million years ago.If 20 nucleotide substitutions have occurred between human and chimpanzee lineages in a sequence of mitochondrial DNA, and 30 have occurred between humans and gorillas, then, according to the molecular clock hypothesis, humans and gorillas separated _______ million years ago.


A) 3
B) 6
C) 9
D) 12
E) 30

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