Genetic Variation in a...
Genetic variation in a population describes the
existence in that population of different alleles,
or alternative forms, for a given gene. The
presence of genetic variation implies that
individuals of the population vary in the alleles
they possess, meaning that individuals differ in
genotype. Genetic loci for which there are
multiple alleles are described as polymorphic.
Humans, for example, are polymorphic for
traits such as eye color and blood type.