Question

Among the following pairwise cytochrome c comparisons, which would show the most amino acid differences, indicating the most distant evolutionary relationship?

Options

• Human vs duck

• Monkey vs duck

• Human vs yeast

• Human vs monkey

Answer 1

Human versus yeast shows many differences in cytochrome c, implying a very distant evolutionary relationship, since yeast is a fungus far removed from animals. Fewer differences occur in human vs monkey, and more in human vs duck.