You Know That a Particular Stretch of DNA Changes at the Rate

question 24

Multiple Choice

You know that a particular stretch of DNA changes at the rate of 1 base per 10 million years.You sequence this length of DNA in two species and find that they differ by 4 bases: AATGCGATCG and AATGTTATGC.Based on these data,how long has it been since these two species diverged? (Hint: Ancestral sequence is AATGCTATGG.)

• A)10 million years
• B)20 million years
• C)40 million years
• D)100 million years

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