Independent assortment of chromosomes at meiosis explains Mendel’s ratio
Meiosis in a diploid cell of genotype A/a; B/b. The diagram shows how the segregation and assortment of different chromosome pairs give rise to the 1: 1:1: 1 Mendelian gametic ratio.

ANIMATED ART: Meiotic recombination between unlinked genes by independent assortment