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spermatogenesis
spermatogenesis The series of cell divisions in the testis that results in the production of spermatozoa. Within the seminiferous tubules of the testis germ cells grow and divide by mitosis to produce spermatogonia. These divide by mitosis to produce spermatocytes, which divide by meiosis to produce spermatids. The spermatids, which thus have half the number of chromosomes of the original germ cells, then develop into spermatozoa.
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"spermatogenesis." A Dictionary of Biology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "spermatogenesis." A Dictionary of Biology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O6-spermatogenesis.html "spermatogenesis." A Dictionary of Biology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-spermatogenesis.html |
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spermatogenesis
spermatogenesis (sperm-ă-toh-jen-i-sis) n. the process by which mature spermatozoa are produced in the testis. Spermatogonia, in the outermost layer of the seminiferous tubules, multiply throughout reproductive life. Some of them divide by meiosis into spermatocytes, which produce haploid spermatids. These are transformed into mature spermatozoa by the process of spermiogenesis. The whole process takes 70–80 days.
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"spermatogenesis." A Dictionary of Nursing. 2008. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "spermatogenesis." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O62-spermatogenesis.html "spermatogenesis." A Dictionary of Nursing. 2008. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-spermatogenesis.html |
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spermatogenesis
sper·mat·o·gen·e·sis / ˌspərmətəˈjenəsis; spərˌma-/ • n. Biol. the production or development of mature spermatozoa. |
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"spermatogenesis." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "spermatogenesis." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O999-spermatogenesis.html "spermatogenesis." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-spermatogenesis.html |
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spermatogenesis
spermatogenesis The formation of sperm (spermatozoa) from a diploid male germ cell. It includes both male meiosis and spermiogenesis.
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Cite this article
MICHAEL ALLABY. "spermatogenesis." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "spermatogenesis." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-spermatogenesis.html MICHAEL ALLABY. "spermatogenesis." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-spermatogenesis.html |
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