Biology / Bio 1019 · Atom · ~20 seconds
Mendel's 3:1 Ratio, Observed
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Mendel found that self-crossing F1 plants produced an F2 generation showing the dominant trait and the recessive trait in a ratio close to three to one.
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Self-crossed violet-flowered F1 plants produced roughly 705 violet-flowered and 224 white-flowered F2 offspring, near a 3:1 split.
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This ratio describes phenotypes in large samples — any small batch of offspring can depart from it by chance.