Differences Between Spermatogenesis And Oogenesis:
The following are the points of Differences Between Spermatogenesis And Oogenesis.
Spermatogenesis | Oogenesis |
---|---|
It occurs in the seminiferous tubules of testes. | It occurs in the follicle cells of ovaries. |
It is completed in testes. | It is completed in the female genital tract. |
Begins only at puberty. | Begins before birth in the foetus. A baby girl is born with a set number of primary oocytes already in prophase I stage. |
After maturity, it is a continuous process and occurs all the time. | Discontinuous process, only one egg matures in about 28 days. |
Here, male sex cells called sperms are formed. | Here, a female sex cell called ovum is formed. |
Each primary spermatocyte divides by meiosis and forms four haploid spermatozoan. | Each primary oocyte divides by meiosis and forms only one haploid ovum. |
Equal cytoplasmic divisions during meiosis I and meiosis II and no formation of polar bodies. | Unequal cytoplasmic divisions during meiosis I and meiosis II and hence the formation of three polar bodies. |
Spermatocytes have normal nucleus and cytoplasm. | Oocytes are rich in RNA, ATP, enzymes, yolk, cytoplasm, a large nucleus with the large nucleolus. |
The growth phase of spermatogenesis is of short duration and there is no synthesis of yolk (vitellogenesis). | The growth phase of oogenesis is of longer duration and there is a synthesis of yolk (vitellogenesis). |
Sperms are minute, yolkless and motile. | Ovum is large, rounded, non-motile with or without the yolk. |
All stages are completed and sperms are formed in the testes only. | The secondary oocyte is released from the ovary and final second meiotic division occurs in the fallopian tube just before fertilization. |
All the spermatogonia form the Primary spermatocytes. | Most of the oogonia do not develop into primary oocytes and form follicle cells. |
Spermatid undergoes spermiogenesis to get transformed into a sperm. | No such stage after the formation of ootid or ovum takes place. |
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