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.

Question

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.

Quizplus · Accepted Answer

There are five substitutions from Species 1 to Species 2 and Species 3. Without access to Species 1, we can infer three substitutions between Species 2 and Species 3.

Below Are Segments of DNA from Three Species of Flies