$A$ gene located on the $Y$-chromosome is inherited from father to son; this is known as:

Which animal exhibits sex determination through the haplo-diploid mechanism?

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:

Barr body in mammals represents

$A$ male child will be born if:

$A$ male child would be born to parents if