A plant breeder is trying to develop a deep purple violet. She knows the purple violets she has can be PP or Pp for the purple color. She crosses two purple violets hoping to produce a deeper color. Of the four plants that result, one is white and three are various shades of purpleâ€”none of them darker than the parents. What can she conclude about the parent plants?

One of the parents' genotype must have been Pp and the other pp.

One of the parents' genotype must have been Pp and the other PP.

Both of the parents' genotype must have been PP.

Both of the parents' genotype must have been Pp

Question

A plant breeder is trying to develop a deep purple violet. She knows the purple violets she has can be PP or Pp for the purple color. She crosses two purple violets hoping to produce a deeper color. Of the four plants that result, one is white and three are various shades of purpleâ€”none of them darker than the parents. What can she conclude about the parent plants?

One of the parents' genotype must have been Pp and the other pp.

One of the parents' genotype must have been Pp and the other PP.

Both of the parents' genotype must have been PP.

Both of the parents' genotype must have been Pp

blues · Answer

The first thing to do is figure out what sort of relationship exists between the different alleles - like is the dominant P completely dominant to p? Or is it incompletely dominant?