Reversal of inbreeding depression. Also called heterosis. Inbreeding Matings between parents that are more related by ancestry. May be matings between closely related individuals. Linkage The tendency for groups of genes to be inherited as a unit.
Linked genes lie near each other on one chromosome.
Loci Position on a chromosome. Mass selection Individual selection. Monozygous twins Genetically identical animals. Mutation Sudden change in the chromosomes. Where this occurs in the gametes, the result may be an aberrant organism with an evolutionary advantage, leading to permanent population change.