Differences between Spermatogenesis and Oogenesis

S.N	Spermatogenesis	Oogenesis
1.	It occurs in seminiferous tubules of testes.	It occurs in ovaries of female.
2.	It results in the production of four sperm cells, all of which are functional.	It results in the formation of only one large egg cell or ovum and three polar bodies.
3.	Mature sperms are very small and active.	Mature eggs are very large and passive.
4.	Spermatogenesis is completed in the testis.	The secondary oocyte is released from the ovary and thus formation of egg takes place outside the ovary.
5.	Spermatid undergoes spermiogenesis to get transformed into a sperm.	No such stage takes place during egg formation.
6.	Millions sperm produce per day.	One ovum per 28 day.
7.	Occurs throughout adult life.	Ends at menopause.
8.	Begins at puberty.	Begins in fetus.
9.	Involved in gamete production in germ line epithelium.	Not involved in gamete production in germ line epithelium.
10.	It is a continuous process.	It is not a continuous process.
11.	Growth phase is short.	Growth phase is prolonged.
12.	It takes 74 days to complete.	It takes days to years.
13.	It forms motile male gamete.	It forms non-motile female gametes.
14.	Sertoli cells are present.	Sertoli cells are absent

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