Question

Hypertrichosis (hairy pinnae) is trait linked to.

• A. X-chromosome
• B. Y-chromosome
• C. Autosomes
• D. None of the above

Answer 1

The correct option is B Y-chromosome

Hypertrichosis is an excessive growth of hair on a particular area of the body which is abnormal for the age, sex or race of an individual. The presence of the excessive coarse black hair on the auricle of the human ear is referred to as hypertrichosis pinnae auris or hairy ears. The condition is primarily restricted to older men and occasionally observed in females. According to the available literature, hypertrichosis pinnae auris is a Y-linked character. A number of studies have shown that the inheritance of the trait is from father to the son, any exceptions can be attributed to the lack of penetrance of the gene or crossing over from Y to X chromosome.

So, the correct answer is 'Y-chromosome'.