Animal reproduction - The timing and pattern of meiosis in mammal differ for males and females

Question

What is the goal of mitosis?

Answer 1

To create an exact copy of the nucleus

Answer 2

Gametogenesis is the production of gametes. In males this is called spermatogenesis, in females oogenesis

Answer 3

In spermatogenesis all four products of meiosis develop into mature gametes --> in oogenesis only one of the four products develops into a mature egg, the others are smaller cells called polar bodies and degenerate.
Spermatogenesis occurs throughout adolescence and adulthood --> during oogenesis mitotic devisions are completed before birth and the production of mature gametes happens between puberty and menopause.
Spermatogenesis produces sperm from precursor cells continuously --> oogenesis has long interuptions

Answer 4

In the seminiferous tubules of the embryonic testes devide into stem cells that divide in spermatogonia which divide in primary spermatocytes. This all happens mitotically. Then during meiosis I the diploid primary spermatocyte splits into two diploid secondary spermatocytes, which during meiosis II both split into two haploid spermatids. In differentiation the four spermatids are developed into mature sperm cells.

Answer 5

In the embryo the mitotic division from the primordial germ cell into diploid oogonium and from ooonium in a primary oocyte occurs. When the follicle stimulating hormone is periodically released during puberty some follicles develop and mature. So the primary oocyte goes through meiosis and splits into one secondary oocyte and one polar body, the secondary oocyte goes through meisosis II when penetrated by a sperm cell, it splits into one fertilized diploid egg and one polar body.