Question

Determine the genotype of the purple flower if (P) is dominant and white (p) is recessive

Answer 1

If the genotype is PP then when crossed with pp all the offspring will be Pp and purple.
If the genotype is Pp then when crossed with pp 50% of the offspring wil be Pp (purple) and 50 % will be pp (white).
These results will allow you to see whether the purple is homozygous (PP) or heterozygous (Pp).