In radishes red and white are purebreeding colors while hybr

In radishes, red and white are pure-breeding colors, while hybrids are purple. If a red (RR) radish is crossed with a white (WW) radish, what will be the phenotype of the F_2 generation (assuming the F_1 generation self-pollinates)?

Solution

Cross between RR and WW would produce RW as F₁. Now assuming that RW is self crossed, we get F₂ as following:

1 RR (RED)

2 RW ( PURPLE)

1 WW (WHITE)

Hence, the ratio is 1:2:1. It is a case of INCOMPLETE DOMINANCE.