$A$ family has $9$ daughters. What is the probability of having a son at the $10$th birth (in $\%$)?

Who traced a specific nuclear structure all through spermatogenesis in a few insects and named it $x-$body?

Which of the following characteristics is shown by a gene located on the $X$-chromosome in males?

$A$ male child will be born if:

Sex-linked genes of man are

The human embryo contains all the genetic instructions necessary to become either male or female. The male embryo contains a master regulatory gene that acts as a biological switch,turning other genes on and off. The absence of this gene results in a female,which remains sexually immature. This master regulatory gene is located on the .....