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Zygote in Biological Definition

Gamete

... 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 ...

Twin

... when a single egg is fertilized to form one zygote ( monozygotic ) but the zygote then divides into two separate embryos . The ... same womb. Depending on the stage at which the zygote divides, identical twins may share the same ...

Zygote

... A zygote ( Greek : ... into a single diploid cell called the zygote . Animal zygotes undergo mitotic cell ... (fraternal). See also Pregnancy zygote intrafallopian transfer Embryogenesis ...

Developmental biology

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

Sperm

... called semen , and is capable of fertilising an egg cell to form a zygote . A zygote can grow into a new organism, such as a human. Sperm cells contain half ...

Bacterial conjugation

... 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

... 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 ...

Ploidy

... 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 ...

Embryo

... 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 ...

Genetic recombination

... 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 ...

Ploidy

... 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 ...

Human

... 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, ...

Infertility

... injection (ICSI) in which a single sperm is injected directly into an egg; the fertilized egg is then placed in the woman's uterus as in IVF. zygote intrafallopian transfer (ZIFT) in which eggs are removed from the woman, fertilized and then placed in the woman's fallopian tubes rather than the ...

Morula

... the 16-cell phase, the 32-cell phase, and the 64-cell phase. The morula is produced by embryonic cleavage , the rapid cell division of the zygote with virtually no growth. The morula is a solid ball; after the 64-cell phase, it develops into a hollow ball, the blastula . ...
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