Using the concept of a molecular clock and the number of synonymous substitutions shown below, when did species B and C last share a common ancestor?
Using the concept of a molecular clock and the number of synonymous substitutions shown below, when did species B and C last share a common ancestor?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Question
#7

Transcribed Image Text:Consider the three frog species and their DNA sequences shown below. Based on
fossil evidence, we know that species A diverged from B/C 30 million years ago.
Using the concept of a molecular clock and the number of synonymous substitutions
shown below, when did species B and C last share a common ancestor?
Note that synonymous substitutions are shown in bold and synonymous differences
between species B and C are bold and red.
10 million years ago
20 million years ago
15 million years ago
30 million years ago
Fossil
30 million years old
Frog species A
GAT CAT AAA TTC
Frog species B
GAT CAA AAT TTT
Frog species C
GAT CAC AAC TTT
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