After ovulation,the ruptured Graafian follicle transforms into which structure?

Give scientific reasons: The spermatids are transformed into spermatozoa by the process called spermiogenesis.

The sperm produces substances of enzymatic nature called sperm lysin. In mammals,it is called

Do all the gametes formed from a parent organism have the same genetic composition (identical $DNA$ copies of the parental genome)? Analyse the situation with the background of gametogenesis and provide a suitable explanation.

In human females,at the time of birth,there are approximately $2$ million primary oocytes. How many of them normally reach maturity during the entire reproductive life of a female?

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