Darwin\'s tubercle is a small thickning on the back upper edge of the ear. It is

Question

Darwin's tubercle is a small thickning on the back upper edge of the ear. It is present at low frequency (~10%) in most human popualtions, although the trait can be as high as 40% in India and 60% in northern Europe. Darwin used it as an example of a vestigial trait in humans; it is hypothesized to be a remnant of the point at the tip of the ear found in some primates.

Based on its overall low frequency in humans, and assuming two alleles and simple dominance/recessiveness at a single gene, is the allele that is responsible for Darwin's tubercle dominant or recessive? Please explain why

Explanation / Answer

Darwin's tubercle gene is a dominant feature that too in autosomal mode. This feature is more likely influenced by the environmental factors. The gene has incomplete penetrance.

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