Homozygote

A homozygote's cells are diploid or polyploid and have the same alleles at a locus (position) on homologous chromosomes. When an organism is referred to as being homozygous for a specific gene, it means that it carries two identical copies of that gene for a given trait on the two corresponding chromosomes (e.g., the genotype is AA or aa). Such a cell or an organism is called a homozygote.

Related Topics:
Cell - Diploid - Polyploid - Allele - Locus - Homologous chromosome - Chromosome - Genotype

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A homozygous dominant genotype occurs when a particular locus has two copies of the dominant allele (e.g., AA). A homozygous recessive genotype occurs when a particular locus has two copies of the recessive allele (e.g., aa).

Related Topics:
Dominant - Recessive

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In humans and many other animals it refers in particular to X-linked genes in males who under usual circumstances have only one X chromosome and are homozygous for all genes that are located on the X-chromosome.

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