Assortative mating and artificial selection.
D000704:Analysis of Variance; D000818:Animals; D001947:Breeding; D002874:Chromosome Mapping; D005260:Female; D005787:Gene Frequency; D005796:Genes; D005828:Genetics, Population; D005838:Genotype; D008297:Male; D008433:Mathematics; D010641:Phenotype; D012641:Selection, Genetic; D012726:Sexual Behavior, Animal