Together, these alleles are called a genotype. If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have ...

Studies on African children with severe malaria show that heterozygous females and hemizygous males for G6PD deficiency are underrepresented. This suggests that inheriting the enzyme deficiency ...

Whereas heterozygous Jak2V617F expression results in a polycythemia vera-like MPN in mice, loss of Jak2 WT allele in hemizygous or homozygous Jak2V617F mice results in markedly increased white ...

When people inherit the condition via their genes, it can be heterozygous or homozygous. “Heterozygous” means the person only has one copy of a gene that causes hemochromatosis, rather than two.