Telolecithal eggs have

Which of the following groups of cells in the male gonad represent haploid cells?

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

At which stage of spermatogenesis does the sperm acquire a mature structure with a nucleus and other organelles?

Number of chromosomes in the secondary oocyte stage in humans is:

Describe the process of spermatogenesis with a labelled diagram.