Comparison of gamete formation in male and female organs in man
| Male organ | Female organ | |
| 1. | Production of sperms begins at puberty | Production of ova begins before birth completed after fertilization |
| 2. | Several primordial germ cells divided repeatedly by meiosis forming diploid spermatogonia | One primordial germ cell repeatedly divides by mitosis to form diploid oogonia |
| 3. | All separate spermatogonia increase in size to form spermatocytes | One of the resulting oogonia enlarges to form primary oocyte the other degenerate |
| 4. | Each primary spermatocyte undergoes the 1st meiotic division to form two secondary spermatocytes which immediately undergo 2nd meiotic division to give rise to spermatids | The primary oocyte undergoes meiosis, unequal division. 1st meiotic gives rise to secondary oocyte with a smaller polar body. The second meiotic division proceeds as far as metaphase but does not continue until a sperm fuse with the oocyte. At fertilization, the 2nd meiotic division produces a large cell the ovum and a second polar body. |
| 5. | Each spermatid differentiates into a spermatozoon | The ovum does not undergo further differentiation and their polar bodies degenerate |
| 6. | A large number of sperms is formed from one primordial cell | One ovum formed from one primordial cell |
CATEGORIES General
TAGS Dr. Bbosa Science
