2Q What is the phenotypic ratio in a dihybrid cross where both dominant genes interact to produce an effect, one by itself produces a different effect but the other by itself fails to produce any effect.
1. 9:7
2. 9:3:4
3. 12:3:1
4. 9:3:3:1
5. None of the above
CORRECT! The group of four include the three carrying the single dominant that produces no effect and the one form that is free of any dominant gene.