[zahy-gos-i-tee, zi-]
noun Genetics.
the characterization of an individual's hereditary traits in terms of gene pairing in the zygote from which it developed. Compare homozygous, heterozygous.
the characterization of twinning and multiple births in terms of the combination of alleles for particular hereditary traits.

1945–50; zyg- + -osity or zygos(is) + -ity

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Medical Dictionary

zygosity zy·gos·i·ty (zī-gŏs'ĭ-tē)
The genetic condition of a zygote, especially with respect to its being a homozygote or a heterozygote.

The American Heritage® Stedman's Medical Dictionary
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