If a purple flower is dominant and a red flower color is recessive how many phenotypes are possible in offsprings of homogeneous purple(pp) crossed with homozygous red(pp)

The diagram shows the results when two parents are crossed. the letters represent alleles for a trait that is controlled by three different genes. which best describes this inheritance pattern? multiple allele because a trait is controlled by three different genes polygenic because the offspring have alleles from both parents multiple allele because the offspring have alleles from both parents polygenic because a trait is controlled by three different genes