The Human Allele That Causes Six Fingers Per Hand Is

The human allele that causes six fingers per hand is dominant over the allele that produces five fingers per hand, yet most humans have five fingers per hand. Why is this so?

A) A Punnett square shows this situation to be impossible.
B) The F2 generation never expresses the dominant trait.
C) The heterozygote expresses the recessive trait.
D) The six-finger allele exists at a low frequency in the human population.

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