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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. 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!