Question

Genetic cross for two grey mice where the offspring are grey,white and black

Answer 1

Let this gene be A. In the case described above, it becomes clear that gene A has incomplete dominance, since such a cross is possible only on the condition that the parent mice are heterozygous. Accordingly, the genetic cross will look like this:

P: Aa (grey) + Aa (grey)

↓

F1: AA (black) + 2 Aa (grey) + aa (white)