Hypertrichosis is a/an ..... trait.

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(A) Hypertrichosis (excessive hair growth on the pinna of the ear) is a classic example of a holandric trait.Holandric traits are determined by genes

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Holandric trait

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(A) Hypertrichosis (excessive hair growth on the pinna of the ear) is a classic example of a holandric trait.Holandric traits are determined by genes located on the non-homologous region of the $Y$ chromosome.Since these genes are present only on the $Y$ chromosome,they are transmitted directly from father to son.Therefore,hypertrichosis is inherited exclusively through the male line.

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