Homozygous and Heterozygous
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A homozygous genotype carries two identical alleles at a locus; a heterozygous genotype carries two different alleles at that same locus.
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A dog with genotype BB or bb for coat color is homozygous; one with genotype Bb is heterozygous.
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Homozygous and heterozygous describe one locus at a time — an organism can be homozygous at one gene and heterozygous at another.