What is the definition of homozygous?

Homozygous refers to having identical alleles for a single trait. An allele represents one particular form of a gene. Alleles can exist in different forms and diploid organisms typically have two alleles for a given trait. These alleles are inherited from parents during sexual reproduction. read more

Homozygous and Heterozygous. If an organism has two copies of the same allele, for example AA or aa, it is homozygous for that trait. If the organism has one copy of two different alleles, for example Aa, it is heterozygous. Keep in mind that an organism can't simply be 'homozygous,' period. read more