Mendel's Pea Plants
In one of his experiments on inheritance patterns, Mendel crossed plants that were true-breeding for violet flower color with plants true-breeding for white flower color (the P generation). The resulting hybrids in the F1 generation all had violet flowers. In the F2 generation, approximately three-quarters of the plants had violet flowers, and one-quarter had white flowers.
Source
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"OpenStax College, Mendel’s Experiments and the Laws of Probability. October 30, 2013."
http://cnx.org/content/m44476/latest/
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