Douglas Harper's Etymology Dictionary
Wiktionary
homozygous
a. Of an organism in which both copies of a given gene have the same allele
WordNet
homozygous
adj. having identical alleles at corresponding chromosomal loci; "these two fruit flies are homozygous for red eye color" [ant: heterozygous]
Usage examples of "homozygous".
Descendants of the homozygous plant all appear tall, while half of the heterozygous descendants will be short.
Fixing traits (producing homozygous offspring) in Cannabis strains is more difficult than it is in many other flowering plants.