Hemizygous - has 1/1 copy of the allele Heterozygous - has 1/2 copies of the allele Homozygous - has 2/2 copies of the allele
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If both alleles are the same, the organism is homozygous for the trait. ...If one allele is missing, it is hemizygous, and if both alleles are missing, ...An organism is heterozygous