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What is the nature of the cross when two pink-colored flowers on their crossing resulted in 1 red, 2 pink, and 1 white flower progeny?

When pure red and white flowers are crossed, partial dominance produces F1 generation plants with exclusively pink flowers. 

These plants produce progeny (F2 generation) with red, pink, and white flowers in a ratio of 1:2:1 when they self-pollinate or fertilize. 

Within a flower, between blooms of the same plant, or between flowers of different species are all examples of cross-pollination.