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Zygote in Medical News

Female Twins Have More To Share Than Just The Similarity: Risk Of Early Menopause

... is believed that premature menopause in identical twins might be to do with the embryo splitting process. Monozygotic twins are derived form a single zygote that divides into two separate entities within the first 2 weeks of development. About 1% of women in general have gone through the menopause by ...
Zygote in Medical Dictionary

Zygote

A zygote (or zygocyte) is a term in Developmental biology used to describe the first stage of a new unique organism when it consists of just a single cell. The term is also used more loosely to refer to the group of cells formed by the first few cell divisions, although... The diploid ...

Identical twins

... know differently, however. ... Scientists discover differences that really set identical twins apart. ... Identical twins emerge when a zygote — the fertilized egg that develops into an ... Many identical twins clearly behave differently as they grow older, and some ... "One would ex...
Zygote in Biological News

New research finds possible genetic link to cause of pregnancy loss and disorders

... bad copy, there were fewer births. Further research revealed this is because aneuploidy was generated in the egg and passed on to the single-cell zygote that forms when a sperm fertilizes an egg. And this led to the loss of the embryo. "This work certainly points to Bub1 having a role in maternal ag...

New egg freezing technique offers hope to hundreds of women

...scientific director of the Unita di Medicina Della Riproduzione, Fondazione HERA, Catania, Italy, told the conference that Italy had banned embryo and zygote freezing in 2004, and any embryos created for IVF, up to a maximum of three, had to be implanted in one transfer. As a consequence of this new law, in...

Scientists unpick genetics of first 15 minutes of life

...process in sexually reproducing animals. The absence or mutation of this gene in the maternal (mother's) genome explains why eggs fail to produce a zygote - or early embryo - despite the presence of 'healthy' sperm. Although the researchers use the fruit fly Drosophila melanogaster to discover the bas...
Zygote in Biological Definition

Zygote

A zygote ( Greek : ζυγωτόν ) is a cell that is the result of fertilization . That is, two haploid cells—usually (but not always) a sperm cell from a male and an ovum from a female —merge into a single diploid cell called the zygote ....

Bacterial conjugation

...uivalent of sexual reproduction or mating ; however it is not actually sexual as it does not involve the fusing of gametes and the creation of a zygote , it is merely the exchange of genetic information. In order to perform conjugation, one of the bacteria has to carry an F- plasmid , the other one ...

Cell growth

...ur special daughter cells ( gametes ) which have half the normal cellular amount of DNA. A male and a female gamete can then combine to produce a zygote , a cell which again has the normal amount of chromosomes. For details see the individual articles on DNA replication , binary fission , mitosis ...

Developmental biology

...ubfield, the study of organisms between the one-cell stage (generally, the zygote ) and the end of the embryonic stage, which is not necessarily the beginn... pangenesis , phylogeny , primordium , pupa , rudiment , teratology , zygote Developmental model organisms Often used model organisms in deve...

Ploidy

...zed over the other. This is called alternation of generations . Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote , for example animals are primarily diploid but produce haploid gametes . During meiosis , germ cell precursors have their number of chromosomes ha...

Embryo

...he seed — it is called a seedling . Animals : The embryo of vertebrates is defined as the stages between the first division of the zygote (a fertilized ovum ) until it becomes a foetus . An embryo is called a foetus at a more advanced stage of development and up until birth or h...

Gamete

...mals, involving a sperm and an egg), they form a zygote —a cell having two complete sets of chromosomes and therefore diploid . The zygote cell receives one set of chromosomes from each of ... cell divisions and cellular differentiation , a zygote develops , first into an embryo , and ultimately...

Genetic recombination

...ation is fairly rare compared to normal recombination, but severe problems can arise if a gamete containing unbalanced recombinants becomes part of a zygote . Offspring with severe unbalances rarely live through birth. Other types of recombination Conservative site-specific recombination In con...

Ploidy

...zed over the other. This is called alternation of generations . Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote , for example animals are primarily diploid but produce haploid gametes . During meiosis , germ cell precursors have their number of chromosomes ha...

Human

...female by the male through sexual intercourse , though in vitro fertilization methods are also used. The developing individual is first called a zygote ; as it grows through successive stages inside the female's uterus over a period of 38 weeks, it is called an embryo , then a fetus . At birth, th...
Zygote in Biological Dictionary

Zygote

A zygote (or zygocyte) is a term in Developmental biology used to describe the first stage of a new unique organism when it consists of just a single cell. The term is also used more loosely to refer to the group of cells formed by the first few cell divisions, although... 3D computer mo...

Umbilical cord

... the connecting cord from the developing embryo or fetus to the placenta. During prenatal development, the umbilical cord comes from the same zygote as the fetus and (in humans)... Umbilical cord prolapse is an obstetric emergency during pregnancy or labor that imminently endangers the life...

Syngamy

...syngamy – Our zoology dictionary has ecology, physiology, genetics of syngamy , ... syngamy The union of nuclei of two gametes to produce a zygote nucleus, ... Pronunciation of syngamy . syngamy synonyms. syngamy usage examples and syngamy quotes. ... syngamy definition. syn·gamy (si...

Sperm cells

...ῷον (living being) and more commonly known as a sperm cell, is the haploid cell that is the male gamete. It joins an ovum to form a zygote. A zygote is a single cell, with a complete set of chromosomes, that... Because sperm cells are haploid, they contribute half of the genetic information...

Ootid

...id . ootid synonyms. ootid usage examples and ootid quotes. ootid mature ovum after penetration by sperm but before the formation of a zygote ... number of the ootid and spermatid? How does ootid differ from a polar ... ootid ( ) n. A haploid cell that results from the meiotic ...

Morula

... Information about morula in the free online English dictionary and encyclopedia. ... morula - a solid mass of blastomeres that forms when the zygote splits; develops ... Morula - Definition of Morula at Dictionary.com a free online dictionary with ... morula ... A morula is usually prod...

Micronucleus

...such as the paramecium. In fission it divides by mitosis, and in conjugation furnishes the pairing of gamete nuclei, by whose reciprocal fusion a zygote nucleus is formed, which gives rise to the macronuclei and micronuclei of the individuals of the next cycle of fission. Thermo Scientific Cellom...

Haploid Cell

...eater than 50% near- haploid , cells with a ... ... proliferation and differentiation of a single haploid cell called the "gamete. ... The zygote undergoes meiosis immediately, creating four haploid cells . ... Haploid - Definition of Haploid at Dictionary.com a free online dictiona...

Fertilization

...or IVF ... Conception and Fertilization : Getting Pregnant During The Luteal Phase of Your Cycle ... With fertilization , the ovum becomes the zygote or embryo and now ... Information about fertilization in the free online ... In cross- fertilization , the two gametes come ... self- fertil...

Endomembrane system

...nd the cell by the endomembrane system , including some proteins. ... Polarization of the endomembrane system is an early event in fucoid zygote ... A polarized endomembrane system not only allows local deposition of membrane and ... ,biological,biology definition,biology terminology,bi...
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