Three independently assorting genes are known to control the following biochemical pathway...

Three independently assorting genes are known to control the following biochemical pathway that provides the basis for flower color in a hypothetical plant:

Three homozygous recessive mutations are also known, each of which interrupts a different one of these steps. Determine the phenotypic results in the F1 and F2 generations resulting from the P1 crosses of true-breeding plants listed here:

(a) speckled (AABBCC) × yellow (AAbbCC)

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(b) yellow (AAbbCC) × green (AABBcc)

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(c) colorless (aaBBCC) × green (AABBcc)