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• a  having identical alleles at corresponding chromosomal loci
  these two fruit flies are homozygous for red eye color

• To taste very weak concentrations, as I did, indicates that the subject is probably homozygous, or has two dominant genes for bitter tasting.

• heterozygous

News & Articles

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• An 'obesity-risk' allele alters hunger-stimulating hormone production
  ( Journal of Clinical Investigation ) Rachel Batterham and colleagues at University College London identify a link between FTO and the hunger-stimulating hormone, ghrelin. Subjects homozygous for the "obesity-risk" allele of FTO had higher concentrations of circulating ghrelin after eating, which correlated with an absence of satiation.
  July 15, 2013 - EurekAlert!