How many sperms are formed from $4$ primary spermatocytes?

The immature stage of eggs is called as:

An unfertilized human egg contains

The mother germ cells are transformed into a mature follicle through a series of steps. Provide the missing steps in the blank boxes.
$\boxed{\text{Oogonia}} \to \boxed{A} \to \boxed{\text{Primary follicle}} \to \boxed{B} \to \boxed{C} \to \boxed{\text{Mature or Graafian follicle}}$

What are the diploid cells in gametogenesis?

At the end of the first meiotic division,the male germ cells differentiate into