After ovulation,the ruptured follicle collapses and fills with blood,forming which of the following structures?

In mammals,the corpus luteum is found in which organ?

Where is the anti-fertilizin located?

When a germ mother cell enters meiosis,it is called .......

Spermatogenesis is under the regulatory influence of

The schematic representation of spermatogenesis is given below. How many chromosomes do $P$,$Q$,and $R$ contain?
$P$ (Spermatogonia) $\rightarrow$ $Q$ (Primary Spermatocyte) $\rightarrow$ $R$ (Spermatid)