Excessive growth of hair on the pinna is a feature found only in males because
The female sex hormone oestrogen suppresses the character in females
The gene responsible for the character is present on the $Y-$chromosomes only
The gene responsible for the character is recessive in females and dominant only in males
The character is induced in males as males produce testosterone
Kappa particles indicate
$A$ $Y-$linked gene is responsible for hypertrichosis (long hair on ears). When an affected man marries a normal woman, what percentage of their daughters would be expected to have hairy ears?
Chromosomal theory of inheritance was proposed by
Mating among close relations is referred