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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'.
Best Answer: Heterozygous is when you have 2 different alleles for a certain characteristic: e.g. You could have a gene for brown eye colour on one chromosome and a gene for blue eyes on the other. In this case the dominant gene of the 2 would be expressed in the individual. Homozygous dominant is when the 2 alleles are the same and they are the dominant form of the gene. e.g. 2 brown eye genes BB Homozygous recessive is when the 2 alleles are the same and are the recessive form of the gene bb. Source(s): Chelsey Kimble Â· 7 years ago.