Humans and gorillas are descended from a common ancestor.
Because there is only one difference in amino acids in the hemoglobin of present day
humans and gorillas, it is likely that the ancestor had identical hemoglobin to one or
the other. Evolution happens by natural selection of one genotype over another. The
differences between individuals of a species occur by mutations of the genes. The short
answer to your question is that the difference was caused by a random mutation of the
DNA of the common ancestor, which was then carried down to present day humans and
gorillas.
Saturday, January 1, 2011
There is a difference of only one amino acid in one chain of the hemoglobin of humans and gorillas. What might have caused this difference?
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