Homozygosity


In diploid organisms, homozygosity is the property of having identical alleles for a particular locus on both homologous chromosomes. Organisms that are homozygous for any particular locus are termed homozygotes. Homozygosity is the opposite of heterozygosity, where two different alleles for a given locus are carried on homologous chromosomes.

If the homozygote carries two dominant alleles for a locus then it is said to be homozygous dominant; if it carries two recessive alleles then it is homozygous recessive.

A homozygous parent can only offer one allele, for the locus at which it is homozygous, to its offspring.