A type of gene allele that maifests its effect only if it is present on both member of a homologous pair of chromosomes or is present on an unmatched sex chromosome (such as the x chromosme In males).
A type of gene allele that maifests its effect only if it is present on both member of a homologous pair of chromosomes or is present on an unmatched sex chromosome (such as the x chromosme In males).