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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'.
Definition of Homozygous Dominant. Many genes come in two versions: the dominant allele and the recessive allele. Since diploid organisms (like you and me) have two copies of each of our genes, we could have one of each allele and be heterozygous or have two of the same and be homozygous.ecause this allele is dominant, we can't know from looking at this cat whether she has two copies of the agouti allele (this would make them homozygous dominant) or whether she has just one agouti allele and carries the recessive non-agouti allele.