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see reproductionreproduction,
capacity of all living systems to give rise to new systems similar to themselves. The term reproduction may refer to this power of self-duplication of a single cell or a multicellular animal or plant organism.
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a cell formed as a result of the fusion of gametes. The term “zygote” was introduced by the German botanist E. Strassburger. As distinct from gametes, a zygote has a diploid (double) set of chromosomes. The zygote develops directly after fertilization or, as in many algae and fungi, takes on a thick covering and becomes a dormant spore, often called a zygospore, for some time.


An organism produced by the union of two gametes.
The fertilized ovum before cleavage.
References in periodicals archive ?
Langman's Embryology notes, "The development of a human begins with fertilization, a process by which the spermatozoon from the male and the oocyte from the female unite to give rise to a new organism, the zygote.
It was shown that microinjection of sequence-specific dsRNA into bovine zygote could trigger a significant decrease of target transcripts until at least day 8 (Tesfaye et al.
Bower proposed that archegoniates were derived from a haploid alga in which chromosome-reduction followed immediately upon formation of a zygote that remained attached to the maternal thallus.
Zygote Human Heart 3 makes it easy for graphics designers, scientists and animators to visualize the human heart, from exteriors and cut views of the interior to an accurate animation of the cardiac cycle.
The development of a human being taking place as a result of execution of the microbioprogram stored in the zygote may be considered as an example of natural software differentiation.
Wade permits a state to interfere in the choice of therapeutic or reproductive use once the zygote (the first cell of a distinct human life) has come into existence.
The policy implications of this are that: (1) If legislation refers to an "embryo" as the locus of legal restrictions, then this would not apply to the single celled zygote before it divides; and (2) if an embryo is defined as the entity resulting from union of a sperm and the egg, then the entity resulting from SCNT is not an embryo.
At the same time it would prohibit a person from "cloning a human being, and from purchasing or selling an ovum, zygote, embryo, or fetus for the purpose of cloning a human being.
Two gametes form a zygote--one cell from two--and the zygotes of malaria parasites do not multiply in the midgut.
When the team loyally supported through the wind and the rain since you were a zygote, sends the letter saying that the European Travel Pass - which costs five pounds and entitles you to precisely NOTHING AT ALL apart from allowing the fan to part with hundreds of pounds for the next European away game in northern Siberia - will not be renewed this year because of over-subscription by johnny-come-lately glory seekers.