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Spermatogenesis

Definition

noun

The process occurring in the male gonad of sexually reproducing organism wherein the undifferentiated male germ cells develop into spermatocytes, which then transform into spermatozoa.


Supplement

The spermatogenesis is the male counterpart of oogenesis in females. The spermatogenesis and oogenesis are the two forms of gametogenesis.

Spermatogenesis consists of stages: (1) spermatocytogenesis, (2) spermatidogenesis, and (3) spermiogenesis.

In humans, it starts at puberty and continues throughout lifetime. It occurs in the male testes and epididymis in a stepwise fashion. The entire process can take approximately 64 days.


Word origin: Greek, from sperma, spermat- (seed) + genesis »from Latin, from Greek, (birth, origin).
Related forms: spermatogenetic (adjective), spermatogenic (adjective)

Compare: oogenesis
See also: gametogenesis

Related terms:


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X chromosome inactivation

... of the X chromosome. The X chromosome of male germ cells is in a condensed chromatin state and is transcriptionally repressed during early spermatogenesis but to my knowledge this is not considered as "X chromosome inactivation". In mammals, X chromosome inactivation is random ...

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by cathbr
Thu Jul 18, 2013 3:56 pm
 
Forum: Molecular Biology
Topic: X chromosome inactivation
Replies: 1
Views: 1511

Re:

... to haploid gametes and diploid makes diploid gametes. Kindly read following references for details, http://www.mendeley.com/research/spermatogenesis-diploid-males-formicine-ant-lasius-sakagamii-3/ http://www.jstor.org/stable/20022189?seq=1 Though inbreeding may be a cause ...

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by Squirrell
Mon Feb 20, 2012 8:38 pm
 
Forum: Zoology Discussion
Topic: Cell identification - germ cells in haploid male ants
Replies: 4
Views: 5124

Cell identification - germ cells in haploid male ants

... to haploid gametes and diploid makes diploid gametes. Kindly read following references for details, http://www.mendeley.com/research/spermatogenesis-diploid-males-formicine-ant-lasius-sakagamii-3/ http://www.jstor.org/stable/20022189?seq=1

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by sachin
Sat Feb 18, 2012 8:08 am
 
Forum: Zoology Discussion
Topic: Cell identification - germ cells in haploid male ants
Replies: 4
Views: 5124

Sporophyte, spermatogenesis and oogenesis?

Can someone practice work for my intro to genetics class State how many chromosomes and chromatid are found is this correct... spermatogenesis --------------------------------------… Primordial germ cells- 2n =46 chromosomes and 46 chromatid..because chromosomes have not yet entered s ...

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by jacobamark99
Fri May 27, 2011 5:38 pm
 
Forum: Genetics
Topic: Sporophyte, spermatogenesis and oogenesis?
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Gamete Formation Definition?

In gamete formation, it's defined as (let's say spermatogenesis) "one spermatogonium cell forms a total of 4 sperm ". However, also following the definition of spermatogenesis: spermatogonium -->(mitosis) 2 primary spermatocytes 2 primary ...

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by jellyksong
Fri Apr 22, 2011 6:02 pm
 
Forum: General Discussion
Topic: Gamete Formation Definition?
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