Define the genotype of each of the pure breeding strains

A surprising result cam in an experiment where two different varietys of pure breeding white-flowered plants were crossed. All of the F1 plants had purple flowers, not white. The F1 offspring self fertilized and the F2 generation resulted in 9 purple flowers: 7 white. (show all steps to recive credit)

a. How many genes are involved in determining the flower color of this plant?

b. Define the genotype of each of the pure breeding strains of white flowered plants

c. How many alleles of each gene are present in the F1 off spring? List all possible genotypes of the F1 gametes

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