1 AABB 2 AABb 2 AaBB 4 AaBb1 AAbb 2 AABb1 aaBB 2 aaBb1 aa 4 dominant genes are red, four recessive genes (no dominant genes) are white, and 2 offspring are purple Dominant genes, and because dominant genes have a superimposed effect, there are colors between red and purple (3 dominant genes, 1 recessive gene) and colors between white and purple (1 dominant gene , 3 recessive genes). Therefore, there should be five types of expressiveness. According to the trademark, the ratio can be 1:4:6:4:1