Wiktionary
homozygosity
n. The condition of being homozygous
WordNet
homozygosity
n. the state of being homozygous; having two identical alleles of the same gene [ant: heterozygosity]
Usage examples of "homozygosity".
While the gene pool in the population was fixed, homozygosity for every desired trait—including some that were not sex-linked—had proven to be a biological impossibility.