A certain segment of DNA can be used as a molecular clock. Its rate of mutation is one mutation per 10 million years. Examine the DNA segments from two different species: Species A: CTTAAGCTAGTAAGGACC Species B: CATAAGTTAGTAAGGTCC Using this example, explain how this information can be used to determine how long ago these two species shared a common ancestor.

Question

A certain segment of DNA can be used as a molecular clock. Its rate of mutation is one mutation per 10 million years. Examine the DNA segments from two different species:   Species A: CTTAAGCTAGTAAGGACC Species B: CATAAGTTAGTAAGGTCC   Using this example, explain how this information can be used to determine how long ago these two species shared a common ancestor.

anonymous · Answer

CTT AAG CTA GTA AGG ACC
CAT AAG TTA GTA AGG TCC
We separate the DNA segments into triplets, now you see there are three letter change which means there are three mutations had done. Since there are three mutations, These two organisms had shared common ancestors 30 million years ago

koikkara · Answer

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