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Homozygous dominant is a genotype that consists of two dominant alleles for a gene. Although a homozygous dominant cat might have the same phenotype, or appearance, as a heterozygous one, the difference is that the homozygous dominant individual will 'breed true'.
A dominant allele can show with only one copy present (B) and recessive needs two alleles present (bb) to show. Remembering that B = dominant, b = recessive... 1. 'Homo' = same. A homozygous trait means the alleles are the same (bb or BB) 2. As I said earlier, you can't really have a heterozygous recessive trait because that would just be Bb, and that's dominant! 3. Hetero = different. A heterozygous dominant trait would be composed of two different alleles, and since it's dominant those alleles would be 'Bb' 4. A homozygous recessive trait would have the same alleles but they would be recessive, so a homozygous recessive trait would be 'bb'. Hope that made some sort of sense!