What is the expected phenotypic proportion, Biology

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In tomatoes, two alleles of one locus determine the character difference of purple versus green stems (alleles are P and p with P being completely dominatn and coding for purple stems) and two alleles of a seperate independent locus determine the character difference of "cut" versus "potato" leaves (allleles are C and c with C being completely dominatn and coding for cute leaves)

Assuming independent assortment, what are the expected phenotypic proportions from the following crosses:

a.) PPCC x ppcc

b.) PpCc x PpCc

c.) PpCC x PpCC


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