homozygous
In a living organism, having two identical alleles for a given trait. Individuals homozygous for a trait always breed true; that is, they produce offspring that resemble them in appearance when bred with a genetically similar individual; inbred varieties or species are homozygous for almost all traits. Recessive alleles are only expressed in the homozygous condition. Heterozygous organisms have two different alleles for a given trait.
© RM 2012. Helicon Publishing is division of RM.
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