If flies that are heterozygous for all three traits are crossed, what proportion

In Drosophila, straight wings are dominant to curved wings (c), smooth eyes are dominant to sparkling eyes (spa), and tan body is dominant to ebony body color (e).  

Part A

If flies that are heterozygous for all three traits are crossed, what proportion of the offspring would you expect to be heterozygous for all three traits?

Part B

If flies that are heterozygous for all three traits are crossed, what proportion of the offspring would you expect to have straight wings, sparkling eyes, and tan bodies?

Part C

If flies that are heterozygous for all three traits are crossed with flies that are homozygous recessive for all three traits, what proportion of the offspring would you expect to be heterozygous for all three traits?

 
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