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Drosophila Mauritiana and D

Question 91

Multiple Choice

Drosophila mauritiana and D.melanogaster diverged 2 million years ago.Between these species, 40 nucleotide differences have accumulated at a gene.At that same gene, D.mauritiana and D.simulans have accumulated 8 nucleotide differences.Assuming that a molecular clock is operating, the best estimate for the divergence time between D.mauritiana and D.simulans is _______ years ago.


A) 100,000
B) 200,000
C) 300,000
D) 400,000
E) 800,000

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