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What is "heterozygous"

Douglas Harper's Etymology Dictionary
heterozygous

1889, from heterozygote, from hetero- + zygote.

Wiktionary
heterozygous

a. Of an organism which has two different alleles of a given gene.

WordNet
heterozygous

adj. having dissimilar alleles at corresponding chromosomal loci; "heterozygous for eye color" [ant: homozygous]

Usage examples of "heterozygous".

Descendants of the homozygous plant all appear tall, while half of the heterozygous descendants will be short.

But look- when we show meiosis reproduction, through the heterozygous population, see what happens.

Any child resulting from that union is then technically the heterozygous grandchild of both clans.

So about 3400 are heterozygous, in any individual, instead of the ten or so predicted by Haldane and Fisher.