Teaching Mendel's second law.
D000818:Animals; D004330:Drosophila; D005260:Female; D005799:Genes, Dominant; D005804:Genes, Lethal; D008040:Genetic Linkage; D005823:Genetics; D008297:Male; D051379:Mice; D011995:Recombination, Genetic; D012730:Sex Chromosomes; D013663:Teaching