The presence of two genotypes in a population.

The existence of two or more genetically different classes within a population.

The occurrence together in the same population of more than one allele or genetic marker at the same locus with the least frequent allele or marker occurring more frequently than can be accounted for by mutation alone.

Condition in which a genetic character occurs in more than one form, resulting in the coexistence of more than one morphological type in a given population.

a naturally occurring variation in the normal nucleotide sequence of the genome within individuals in a population

Presence of several genetically controlled variants in a population.

A difference in DNA sequence among individuals, groups, or populations, which may be the result of chance processes or may have been induced by external agents.

Difference in DNA sequence among individuals, groups, or populations (e.g., genes for blue eyes versus brown eyes).

The occurrence of one or more different alleles at the same locus in a one percent or greater of a specific population.