Question

On selfing a plant of F1-generation with genotype
"AABbCC", the genotypic ratio in F2-generation
will be
(1) 1:2:1
(2) 1:1
(3) 9: 3:3:1
(4) 27:9:9:9:3: 3:3 : 1​

Answer 1

Selfing is the process of fertilization with polar or male gametes of the same individual. AABbCC will produce two type of gametes ABC and AbC. Since, AABbCC contains only one heterozygous allelic pair 'Bb', the cross would behave as a monohybrid cross leading to 3 : 1 phenotypic ratio in F2 generation.