For Aa × Aa with complete dominance, the phenotypic ratio is

3:1 (dominant : recessive) AA + 2Aa = 3 dominant phenotypes; aa = 1 recessive phenotype.

1:2:1 (genotype, not phenotype)

9:3:3:1 (typical dihybrid ratio)

Mendelian Genetics

AP Biology· difficulty 2/5

For Aa \times Aa with complete dominance, the phenotypic ratio is

Explanation

AA + 2Aa = 3 dominant phenotypes; aa = 1 recessive phenotype.

Want 10 more like this — adaptive to your weak spots?