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| 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 such an
organism is called a homozygote. 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). This can occur when both parents carry at least one copy of
the allele. |This page uses Creative Commons Licensed content
from Wikipedia (view authors).|