Hypertrichosis of pinna occurs only in males because __________________.

Estrogen suppresses the trait in females

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It is induced by testosterone in males

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Gene for it is present only on Y-chromosome

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Its gene is recessive in females and dominant in males

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Solution

The correct option is C Gene for it is present only on Y-chromosome
Auricular hypertrichosis (hypertrichosis lanuginosa acquisita, hypertrichosis pinnae auris) is a genetic condition expressed as long and strong hairs growing from the helix of the pinna. It is Y-linked. Hence, it occurs only in males.

So, the correct answer is 'Gene for it is present only on Y-chromosome'.

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