If two alleles code for the same trait (such as blond hair), they are said to be homozygous.
Alleles are the two alternative forms of a gene. One form of a gene is wild type that codes for a certain trait. The alternative form generally arises due to the mutations. The alleles are found in the same locus of the non-sister chromatids of the homologous chromosomes.
Homozygous is a condition a condition of the gene where it possesses the same set of alleles. Therefore they are also called true bred gene. Either both the alleles will be dominant or both will recessive.
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