hemizygote /-zī″gōt/ [Gk, hemi + zygon, yoke] , an individual, organism, or cell that has only one allele for a specific characteristic. The trait specified by the allele is expressed regardless of whether the allele is dominant or recessive. Such alleles include those on the single X chromosome in males, which have no corresponding alleles on the Y chromosome. −hemizygotic, hemizygous, adj., −hemizygosity, n.
