Definition of heterozygosis in English:

heterozygosis

Syllabification: het·er·o·zy·go·sis
Pronunciation: /ˌhetərōzīˈgōsis/

Entry from US English dictionary

noun

1 Genetics The state of being a heterozygote.
1.1 Biology The formation of a zygote through the fusion of genetically different gametes.

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