S5.1 Maize ears, 9:3:3:1 segregation, dihybrid cross.
Demonstrates Mendelian genetics by looking at the R (Colour) and Su (Endosperm) alleles in a dihybrid F2 corn ear from a cross between Purple(RR) Starchy(SuSu) with Yellow(rr) Sweet(susu).
P RR SuSu x rr susu
F1 Rr Susu
F1 cross Rr Susu x Rr Susu
F2 phenotypes Purple/Starchy, Purple/Sweet, Yellow/Starchy, Yellow/Sweet in a 9:3:3:1 ratio.