Below are short fragments of DNA sequences from two yeast strains (A and B) , which have been diverging from each other, as well as a short fragment from their common ancestor (C) .
Yeast A: TGACTGCAAACATCCTAG
Yeast B: TGCCTGGACACATCGAAG
Yeast C: TGCCTGGAAACCTCCTAG
Lacking information from the common ancestor, what would you conclude is the minimum number of evolutionary changes occurring between strains A and B?
A) three
B) four
C) five
D) six
E) seven
Correct Answer:
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