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zygote

/ˈzaɪgoʊt/
/ˈzaɪgəʊt/
IPA guide

Other forms: zygotes

A zygote is a fertilized egg.

The sperm cell (spermatozoon) and the egg (ovum) each have only half the genes of the parent cell — they're haploid cells. When the spermatozoon fertilizes the ovum, the resulting cell has the full complement of genes, so it's a diploid cell. The diploid cell then divides rapidly, becoming first an embryo, then a fetus. The word zygote comes from the Greek word for yoke — joining two things together, like hitching two oxen together to pull a plow.

Definitions of zygote
  1. noun
    (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell)
    synonyms: fertilized ovum
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    types:
    heterozygote
    (genetics) an organism that has two different forms of a particular gene, resulting in different outcomes in the offspring
    homozygote
    (genetics) an organism having two identical alleles of a particular gene and so breeding true for the particular characteristic
    type of:
    cell
    (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
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