An excess of synonymous to non-synonymous differences the FoxP2 sequence of humans relative to the FoxP2 sequence of chimpanzees implies that:
A. FoxP2 is a highly conserved transcription
factor.
B. The function of FoxP2 has been under
positive selection in the human lineage but
that the expression pattern of FoxP2 has not.
C. The expression pattern of FoxP2 has been
under positive selection in the human lineage
but that the function of FoxP2 has not.
D. The function of FoxP2 has been under
positive selection in the human lineage. No
inferences regarding the effect of positive
selection acting on the expression pattern of
FoxP2 are possible based on these data.
D
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