Bird females have chromosome arrangement as

Excessive growth of hair on the pinna is a feature found only in males because

What are allosomes?

Henking observed that in a few male insects,$50 \%$ of the sperm received a specific nuclear structure known as $X$-body,whereas the other $50 \%$ of sperms did not receive it. This method of sex determination was:

What is the result if the $X$ chromosome is lost during the development of certain cells in an organism?

Provide information on the chromosomal theory of sex determination.