Q. Concerning events during the periods of life how different is the gametogenesis in men and in women?

The formation of spermatogonia in men takes place during the embryonic period and formation of sperm cells however is a continuous process that begins in the puberty and goes on until old age and sometimes during all the remaining life of the man.

In women all oogonia are formed before birth and oogonia turn into oocytes I that enter the first division of meiosis (meiosis I) this division however is interrupted at prophase and continues only in puberty. After the beginning of menses an egg cell is released during each period and if fecundated it finishes the meiotic division and oogenesis stops after menopause (cessation of the menstrual activity) and the climacteric period of life begins.