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| :''For other meanings see ].'' | :''For other meanings see ].'' | ||
| A '''zygote''' (from Greek ζυγωτός ''zugōtos'' "joined" or "yoked", from ζυγοῦν ''zugoun'' "to join" or "to yoke")<ref>{{cite web| url=http://www.myetymology.com/english/zygote.html |title=English etymology of zygote |publisher=myetymology.com}}</ref> is a ] that is the result of ]. That is, two ] cells—usually an ] from a ] and a ] cell from a ]—merge into a single ] cell called the ''zygote'' (or ''zygocyte''). |
A '''zygote''' (from Greek ζυγωτός ''zugōtos'' "joined" or "yoked", from ζυγοῦν ''zugoun'' "to join" or "to yoke")<ref>{{cite web| url=http://www.myetymology.com/english/zygote.html |title=English etymology of zygote |publisher=myetymology.com}}</ref> is a ] that is the result of ]. That is, two ] cells—usually an ] from a ] and a ] cell from a ]—merge into a single ] cell called the ''zygote'' (or ''zygocyte''). | ||
| In humans, a zygote exists for about four days, at which time it becomes a ].<ref>Blackburn, Susan. page 80 (Elsevier Health Sciences 2007).</ref> A zygote begins as a fertilized egg (ovum), and contains all of the genetic information (]) necessary to become a baby; half of that information is from the mother’s egg and half from the father’s sperm that has fertilized the egg. The zygote travels down the ], while ]. | |||
| ==Twins== | ==Twins== | ||
Revision as of 05:33, 15 February 2009
- For other meanings see Zygote (disambiguation).
A zygote (from Greek ζυγωτός zugōtos "joined" or "yoked", from ζυγοῦν zugoun "to join" or "to yoke") is a cell that is the result of fertilization. That is, two haploid cells—usually an ovum from a female and a sperm cell from a male—merge into a single diploid cell called the zygote (or zygocyte).
Twins
Twins and multiple births can be monozygotic (identical) or dizygotic (fraternal), meaning they arise from one or several (strictly, two) fertilization events. Polyspermic zygotes in mice have been manipulated so as to remove one of the two male pronuclei and made to survive birth.
In other species
A biparental zygote is a Chlamydomonas (a kind of algae) zygote that contains chloroplast DNA (cpDNA) from both parents.
References
- "English etymology of zygote". myetymology.com.
- "Birth of normal mice after removal of the supernumerary male pronucleus from polyspermic zygotes". National Center for Biotechnology Information.
See also
| Preceded byOocyte Sperm |
Stages of human development Zygote |
Succeeded byEmbryo |
| Human embryonic development in the first three weeks | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Week 1 | |||||||||
| Week 2 (Bilaminar) | |||||||||
| Week 3 (Trilaminar) |
| ||||||||
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