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Homozygous - A Genetics Definition



This graphic displays an example of homozygous alleles for seed shape.

Image Courtesy Evelyn Bailey

Definition: Homozygous refers to having identical alleles for a single trait.

Related Terms: Allele, Genes, Heterozygous

Examples: The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r). A homozygous plant would contain the following alleles for seed shape: (RR) or (rr).

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