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  • Current: Mar 23, 2022

Homozygous

Homozygous means having a same allele of a given gene.

In the following example, locus 2 is homozygous, whereas loci 1 and 3 are heterozygous.

Public comain image showing alleles and loci

Definitions in the literature

  • having identical alleles of a gene [1].
  • carrying two copies of the same allele of a given gene; also called true-breeding [2].