Continuous variation

Of a population, a more or less continuous range of small differences in a given trait among its individuals.

Codominance

In heterozygotes, simultaneous expression of a pair of no identical alleles that specify different phenotypes.

Independent assortment

Mendelian theory that by the end of meiosis, each pair of homologous chromosomes (and linked genes on each one) are sorted before shipment to gametes independently of how the other pairs were sorted. Later modified to account for the disruptive effect of crossing over on linkages.

Segregation Mendelian theory

Sexually reproducing organisms inherit pairs of genes (on pairs of homologous chromosomes), the two genes of each pair are separated from each other at meiosis, and they end up in separate gametes.

Epistasis

Interaction between two genes alleles for one trait.

Example golden retriever color.