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Difference between Spermatogenesis and Oogenesis

Gametogenesis is the process by which male and female sex cells (gametes) i.e., sperms and ova are formed, respectively, in the male and female gonads (testes and ovaries).

Gametogenesis is of two types: Spermatogenesis and Oogenesis.

Spermatogenesis: The process of formation of sperms is called Spermatogenesis. It occurs in the seminiferous tubules of the testes. Spermatogenesis includes formation of spermatids and formation of spermatozoa.

Oogenesis: The process of formation of a mature female gamete (ovum) is called oogenesis. It occurs in the ovaries (female gonads). It consists of three phases: multiplication, growth and maturation.
Spermatogenesis and Oogonim 
Spermatogenesis vs Oogenesis

It occurs in the testes
It occurs in the ovaries
A primary spermatocyte divides to form two secondary spermatocytes
A primary oocyte divides to form one secondary oocycte and one polar body.
A secondary spermatocyte divides to form two spermatids
A secondary oocyte divide to form one ovum and one polar body
No polar body is formed
Polar bodies are formed
A spermatogonium forms four spermatozoa
An oogonium forms only one ovum.
It is generally completed in the testes and thus mature sperms are released from the testes.
It is often completed in the female reproductive tract or in many animals in water because oocytes are released from the ovaries.
To take part in reproduction, the spermatids have to transform into thread like sperms by the process of spermiogenesis
Ootids as such take part in reproduction.
Both maturation divisions are completed in testes themselves
First maturation division is completed in the ovaries but the second one is completed outside ovaries after fertilization begins.
It is a continuous process and completed in approximately 74 days.
It is a discontinuous process and completed in a few days to years.
Mammalian Sperms
(a)A sperm is formed of four parts: Head, neck, middle piece and tail.
(b)Small amount of cytoplasm is present
(c)Nucleus condensed with no nucleoplasm.

(d)Centrioles is present.
(e)Mitochondrion is compactly arranged and form a spiral called nebenkern.
(f)Sperm is flagellated and motile.

(g)Surrounded by only plasma membrane.
Mammalian ovum
(a)Ovum is alecithal and has an excentric nucleus.
(b) Large amount of cytoplasm is present.
(c)Nucleus is bloated with nucleoplasm and is called germinal vesicle.
(d)Centrioles is absent.
(e) Mitochondria scattered in the cytoplasm.

(f)Ovum is spherical and non motile.
(g)Surrounded by a number of egg envelopes.

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