Differences Between Spermatogenesis And Oogenesis

Differences Between Spermatogenesis And Oogenesis:

The following are the points of Differences Between Spermatogenesis And Oogenesis.

SpermatogenesisOogenesis
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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