having different alleles at one or more genetic loci.

having identical alleles at one or more genetic loci; characterized by or relating to this.

Lacking the dominant allele (at a particular locus or loci).

Genetics. Originally: having, or characterized by having, one dominant and one recessive allele at a given locus (= heterozygous adj. at heterozygote…

Having a single unpaired allele at a particular genetic locus, as at all the loci in an XO pair of sex-chromosomes and some of the loci in an XY…

Genetics. Of a polyploid individual: having the dominant allele of a particular gene represented four times.

having three different alleles of a gene.

Having more than one allele of a particular gene.

Having only one allele of a particular gene; of or pertaining to organisms that have identical alleles of some gene.

Genetics. Designating, relating to, or possessing a mutant allele that produces no functional gene product.