Comparable segments of the mitochondrial DNA sequences of two similar species are shown below. This segment of DNA mutates at a
rate of one base pair per 33 million years. Based on these DNA sequences, how long ago did the two species diverge from a common ancestor? Species A mtDNA sequence: TACAAGATAC
Species B mtDNA sequence: TACGCGTAAC
a. 99 million years ago
b. 33 million years ago
c. 66 million years ago
d. 132 million years ago
Pretty sure it's 66 million years (c) because there are 4 differences in total, then divide that in 2 to get 2, then multiply that by 2 to get 66 million. I'll tell you if it's right I'm taking the quiz right now. Yeah it was right
