Author:
Kristi Prohm

Date of Publication:
May 03, 2019

Publication:
The Better Breeding Blog

Excerpt:
Inbreeding is the mating of related animals with the effect of increasing homozygosity.

Outbreeding (also called crossbreeding) is the opposite of inbreeding, in that unrelated animals are mated with the effect of increasing heterozygosity.

Let’s step through an example by starting with two unrelated populations, 1 and 2.

Population 1 has gene frequencies at the A locus of p₁ = 0.8 and q₁ = 0.2.
Population 2 has gene frequencies at the A locus of p₂ = 0.1 and q₂ = 0.9.

Right away we can tell the two are unrelated as the gene frequencies differ so much.

Now cross them to create an F₁ generation. (Back in Explaining Mendel’s Results Visually we defined an F₁ generation as one resulting from the crossing of two purebred populations. Here we are using it more broadly to include two unrelated, but not necessarily purebred, populations.)

Read the rest of the article: https://betterbreeding.solutions/index.php/blog/the-effect-of-mating-systems-on-gene-and-genotypic-frequencies-outbreeding