Hemizygote

Hemizygote is a diploid individual with only one allele at a given locus or gene instead of typical two (as in Homozygote or Heterozygote). The men are physiologically hemizygous for the genes located on X chromosome with the exception of the genes within the pseudoautosomal regions of chromosome X as their homologous copies are present on chromosome Y.

Related articles

 * Homozygote
 * Heterozygote