Histones are proteins that play important roles in gene regulation.Between plants and animals, only two amino acid changes have occurred in the histone H4 protein, despite many synonymous changes.What can we infer from this observation?
A) A great deal of genetic drift is taking place.
B) Most of the amino acid changes are neutral.
C) Strong purifying selection is acting on these genes.
D) Strong positive selection is acting on these genes.
E) These genes are pseudogenes.
Correct Answer:
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