Any difference between cells or groups of organisms of any type of species caused by genetic differences. Some examples of variation would be: height, able to roll tongue, hair color, eye color, or attached/unattached earlobes.
Heritability
Ratio of variation due to differences between genotypes to the phenotype variation for a character or trait.
Overproduction
Lead to adaptations and variations in species.
Reproductive Advantage
Organisms pass on different traits from on another.
