ANA SAYFA


SPERMATOGENESIS AND OOGENESIS
 
 
 
*Spermatogenesis
 
→In the male reproductive system; the process of producing sperm is called spermatogenesis.
 
→The sperm production begins at puberty and continues throughout life.
 
 
 
 
 
→Spermatogonium, undergoes interphase and primary spermatocyte forms.
 
→Primary spermatocyte, undergoes first meiotic division and thus, secondary spermatocytes form.
 
Secondary spermatocytes, undergo second meiotic division and thus, four spermatids form. 
 
→After spermatids differentiation, 4 sperms form.
 
 
 
Sperm structure:
 
 
 
 
*Oogenesis
 
→In the female reproductive system: the process of producing ovum (egg) is called oogenesis.
 
→The production of ovum begins at puberty and continues until menopause.
 
 
 
 
 
→Oogonium, undergoes interphase and primary oocyte forms.
 
→Primary oocyte, undergoes first meiotic division and thus, first polar body and secondary oocyte cells form. 
 
Both of the cells, undergo second meiotic division and thus, 3 second polar bodies and 1 ootid cells form.
 
 
→The 3 second polar bodies cells degenerate.
 
 
→After ootid differentiation1 ovum forms.
 
 
 
Ovum structure:

 

 
 
 
 
 
 
 
 
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