Oogenesis

Spermatogenesis

Oogonium

(female germ cell)

Spermatogonium

(male germ cell)

Germ cells committed

to Meiosis

Primary Oocyte

Primary Spermatocyte

First Meiotic Division

Secondary

Oocyte

First Polar

Body

Secondary

Spermatocyte

Secondary

Spermatocyte

Second Meiotic Division

4 Spermatids

1 Ovum

( 1 viable gamete)

4 Spermatozoa

( 4 viable gametes)