The genotype of F1 generation is AABbCC Number of gametes that are obtained by crossing can be obtained by formula =2n (where n represents the number of heterozygous gametes) Thus, the number of heterozygous gametes =21=2 2 gametes formed are: ABC and AbC. On self crossing F1 generation, the phenotypes that are formed in F2 generation are in the ratio of 3:1