Possessing different genes from each parent for a particular trait.

A genetic characteristic containing a dominant and recessive gene.

Having two or more different versions of a specific gene.

Having two different alleles of a gene at corresponding loci (sites) on homologous chromosomes. A person heterozygous for a given trait inherits one allele from each parent, and the dominant allele usually manifests itself.

Describing an individual in whom the members of a pair of genes determining a particular characteristic are dissimilar.

Possessing different alleles at a given locus.

The progeny that arises from mating two pure but distinct strains.