In a species of flowering plant, the synthesis of a red floral pigment occurs via a two-step biochemical pathway as shown below:
A plant geneticist crosses a plant with the genotype AaBb AaBb\,AaBb with a plant with the genotype AabbAabbAabb.
Assuming the genes assort independently, what is the expected ratio of phenotypes in the offspring of this cross?
3 Red:3 Pink:2 White3 \text{ Red} : 3 \text{ Pink} : 2 \text{ White}3 Red:3 Pink:2 White
9 Red:3 Pink:4 White9 \text{ Red} : 3 \text{ Pink} : 4 \text{ White}9 Red:3 Pink:4 White
4 Red:3 Pink:1 White4 \text{ Red} : 3 \text{ Pink} : 1 \text{ White}4 Red:3 Pink:1 White
9 Red:7 White9 \text{ Red} : 7 \text{ White}9 Red:7 White