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alemão búlgaro chinês croata dinamarquês eslovaco esloveno espanhol estoniano farsi finlandês francês grego hebraico hindi holandês húngaro indonésio inglês islandês italiano japonês korean letão língua árabe lituano malgaxe norueguês polonês português romeno russo sérvio sueco tailandês tcheco turco vietnamês

Definição e significado de Zygote

Definição

zygote (n.)

1.(genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell)

Zygote (n.)

1.(MeSH)The fertilized OVUM resulting from the fusion of a male and a female gamete.

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Sinónimos

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zygote (n.)

zygotic

Locuções

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Wikipedia

Zygote

                   

A zygote (from Greek ζυγωτός zygōtos "joined" or "yoked", from ζυγοῦν zygoun "to join" or "to yoke"),[1] or zygocyte, is the initial cell formed when two gamete cells are joined by means of sexual reproduction. In multicellular organisms, it is the earliest developmental stage of the embryo. In single-celled organisms, the zygote divides to produce offspring, usually through meiosis.

A zygote is always synthesized from the union of two gametes, and constitutes the first stage in a unique organism's development. Zygotes are usually produced by a fertilization event between two haploid cells—an ovum (female gamete) and a sperm cell (male gamete)—which combine to form the single diploid cell. Such zygotes contain DNA derived from both the parents, and this provides all the genetic information necessary to form a new individual.

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  Plants

In land plants, the zygote is formed within a chamber called the archegonium. In seedless plants, the archegonium is usually flask-shaped, with a long hollow neck through which the sperm cell enters. As the zygote divides and grows, it does so inside the archegonium.

  Animals

In animal development, the term zygote is also used more loosely to refer to the group of cells formed by the first few cell divisions, although this is properly referred to as a morula.[2]

In mammalian reproduction, after fertilization has taken place the zygote travels down the fallopian tube, while dividing to form more cells[3] without the zygote actually increasing in size. This cell division is mitotic, and is known as cleavage.[4] All mammals go through the zygote stage of life. Mammalian zygotes eventually develop into a blastocyst, after which they are more generally termed an embryo, and then a fetus.

A human zygote exists for about four days, and becomes a blastocyst on the fifth day.[5]

  In other species

A biparental zygote is a Chlamydomonas (a kind of algae) zygote that contains chloroplast DNA (cpDNA) from both parents.

  See also

  References

  1. ^ "English etymology of zygote". myetymology.com. http://www.myetymology.com/english/zygote.html. 
  2. ^ Neas, John F. "Human Development". Embryology Atlas
  3. ^ O’Reilly, Deirdre. "Fetal development". MedlinePlus Medical Encyclopedia (2007-10-19). Retrieved 2009-02-15.
  4. ^ Klossner, N. Jayne and Hatfield, Nancy. Introductory Maternity & Pediatric Nursing, p. 107 (Lippincott Williams & Wilkins, 2006).
  5. ^ Blackburn, Susan. Maternal, Fetal, & Neonatal Physiology, p. 80 (Elsevier Health Sciences 2007).
Preceded by
Oocyte + Sperm cell
Stages of human development
Zygote
Succeeded by
Embryo
   
               

 

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