Some dogs are of black color, others are brown and some are of white color. When white
dogs were crossed with brown, produced all white dogs in F1. Phenotypic proportions in
F2 were 36 white, 9 black and 3 brown offsprings. What is the mode of interaction in this
trait? If black offspring of F2 were crossed among themselves, what would the phenotypic
proportions in offsprings.