If g=yellow and g=green, and at a separate gene p=purple and p=white, what proportion of your offspring will be green and purple if you cross a ggpp individual with a ggpp individual?

One of each four.

Explanation:

When you cross ggPp x GgPp you get the following offspring:

GgPP   GgPp   ggPp   and   ggpp and they are all expected in the same proportions. The breeder wants green and purple offspring, or ggP- and you can see that that corresponds to ggPp which is expected in a proportion of one of every four offspring.

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