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Encyclopedia > Zygote
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Dorlands/Elsevier z_01/12871436
For other meanings see Zygote (disambiguation).

A zygote (from Greek zugōtos ‘joined’, from zugoun ‘to join’) 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). Elseviers logo. ... Zygote can mean: Zygote, a fertilized biological cell Zygote, the first solo album from John Popper, lead singer of Blues Traveler Zygote was a firm who made CGI models and software; it is now known as Daz3D Category: ... Drawing of the structure of cork as it appeared under the microscope to Robert Hooke from Micrographia which is the origin of the word cell being used to describe the smallest unit of a living organism Cells in culture, stained for keratin (red) and DNA (green) The cell is the... Categories: Biology stubs ... Ploidy is the number of homologous sets of chromosomes in a biological cell. ... A human ovum Sperm cells attempting to fertilize an ovum An ovum (plural ova) is a haploid female reproductive cell or gamete. ... For other uses, see Female (disambiguation). ... For other uses, see Sperm (disambiguation). ... This article is about the Male sex. ... Ploidy is the number of homologous sets of chromosomes in a biological cell. ...

In mammals, fusion of the sperm with the ovacyte occurs in the Fallopian tube and the resulting diploid zygote becomes embedded in the uterus wall.

Animal zygotes undergo mitotic cell divisions to become an embryo. Other organisms may undergo meiotic cell division at this time (for more information refer to biological life cycles). Mitosis divides genetic information during cell division. ... This does not adequately cite its references or sources. ... For other uses, see Embryo (disambiguation). ... For the figure of speech, see meiosis (figure of speech). ... A life cycle is a period involving one generation of an organism through means of reproduction, whether through asexual reproduction or sexual reproduction. ...


Twins and multiple births can be monozygotic (identical) or dizygotic (fraternal), meaning they arise from one or several (strictly, two) fertilization events. For other uses, see Twin (disambiguation). ... Quadruplet, quintuplet, etc. ...

However, 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 zygote that contains chloroplast DNA (cpDNA) from both parents. Species See text. ... Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. ... The structure of part of a DNA double helix Deoxyribonucleic acid, or DNA, is a nucleic acid molecule that contains the genetic instructions used in the development and functioning of all known living organisms. ... abbreveation for Chloroplast DNA ...

See also

Preceded by
Stages of human development
Succeeded by
The placenta (Latin for cake, referencing its appearance in humans) is an ephemeral organ present in placental vertebrates, such as eutherial mammals and sharks during gestation (pregnancy). ... Decidua is the term for the uterine lining (endometrium) during a pregnancy. ... Before the fertilized ovum reaches the uterus, the mucous membrane of the body of the uterus undergoes important changes and is then known as the decidua. ... Chorionic villi are villi that sprout from the chorion, in order to give a maximum area of contact with the maternal blood. ... The trophoblast proliferates rapidly and forms a network of branching processes which cover the entire ovum and invade and destroy the maternal tissues and open into the maternal bloodvessels, with the result that the spaces in the trophoblastic network are filled with maternal blood; these spaces communicate freely with one... The gestational sac is the only available intrauterine structure that can be used to determine if an intrauterine pregnancy (IUP) exists, until the embryo is identified. ... For the alien race in Stephen Donaldsons The Gap Cycle, see Amnion (Gap Cycle). ... A drawing of the amniotic sac from Grays Anatomy. ... amniotic sac The amniotic sac is a tough but thin transparent pair of membranes, which hold a developing embryo (and later fetus) until shortly before birth. ... For the entertainment company see Chorion (company) The chorion surrounds the embryo and other membranes. ... An Introduction to Histogenesis Histogenesis is defined as the formation of tissues and organs from undifferentiated cells (Encarta Dictionary). ... Programmed cell death (PCD) is the deliberate suicide of an unwanted cell in a multicellular organism. ... Mouse embryonic stem cells. ... The cells that give rise to the gametes are often set aside during cleavage. ... Organogenesis is a stage of animal development where the ectoderm, endoderm, and mesoderm are formed. ... The vertebrate limb arises out of a general morphogenetic area called a limb field. ... In embryology, the limb bud is a structure formed by the developing limb, derived from lateral plate mesoderm[citation needed]. It is intimately related with the apical ectodermal ridge, which secretes factors inducing the initial differentiation of the limb bud. ... The Apical Ectodermal Ridge (AER) is a critical component in vertebrate limb development. ... Transverse section showing the lens and the optic cup. ... Cutaneous structures arise from the epidermis and include a variety of features such as hair, feathers, claws and nails. ... The heart is the first functional organ in a vertebrate embryo. ... In prenatal development, the urinary and reproductive organs are developed from the intermediate mesoderm. ...

  Results from FactBites:
Zygote - Wikipedia, the free encyclopedia (137 words)
A zygote (Greek: ζυγωτόν) is a cell that is the result of fertilization.
That is, two haploid cells—usually (but not always) an ovum from a female and a sperm cell from a male—merge into a single diploid cell called the zygote (or zygocyte).
Animal zygotes undergo mitotic cell divisions to become an embryo.
Zygote Adoption - Adoption Encyclopedia (470 words)
A key disadvantage mentioned by many critics of zygote adoption is that it appears likely money would change hands, especially between a donor mother and the gestational mother who carries the child.
In addition, the problem of many infertile couples-the denial of infertility-is clearly a potential problem in zygote adoption, where the surrogate mother can represent to herself and others that the child is genetically her own child.
Parents may choose not to tell the child at all of the genetic heritage, which could result in serious trauma if and when the child later learns he or she is not genetically related to the mother and/or father.
  More results at FactBites »



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