Below Are Segments of DNA from Three Species of Flies

question 235

Multiple Choice

Below are segments of DNA from three species of flies.Species 1 is the common ancestor of species 2 and species 3, and we have access to its DNA because it was preserved in amber. Species 1: AACTACTGCACGCTCATA
Species 2: AACTAGTGCTCGCTCACA
Species 3: AATTACTGCACGCTCACA
Having access to Species 1, we can infer that there have been _______ substitutions from Species 1 to Species 2 and Species 3.Lacking access to Species 1, we could infer that there have been _______ substitutions between Species 2 and Species 3.

• A) four; two
• B) four; four
• C) five; three
• D) five; four
• E) five; five