Question: what is the difference between hemizygous and heterozygous?
Answer: If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus. If one allele is missing, it is hemizygous, and, if both alleles are missing, it is nullizygous. ... But most genes have two or more alleles.