Kyle R. answered 10/06/16
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Mathematics and Science Tutor - Graduate Student
An allele pair including both a dominant allele and a recessive allele is called a heterozygous genotype. Two dominant alleles are homozygous dominant, and two recessive alleles are homozygous recessive. The prefix hetero- means "different," so you can remember that two different alleles is called a heterozygous genotype.