What proportion of the purple flowered

Mendel crossed pea plants that were PP ID (purple flowers and short stems) with pp ID (white flowers and tall stems), and self-pollinated the F1 to obtain an F2. The two loci assort independently. Purple is dominant to white and tall is dominant to short. What proportion of the purple flowered, short stem plants in the F2 are expected to be pure breeding. Show your work.

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