The traits controlled by the genes located on the $X$ chromosome of human beings are said to be:

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:

Sex-linked traits are the traits determined by

The fruit fly, $Drosophila \text{ melanogaster}$, has a diploid chromosome number of $8$. Its chromosome complement consists of:

The chromosomes which determine the somatic characters are called

Which of the following is produced from an unfertilized egg?