The purple-flowered F[1] hybrids
   from a monohybrid cross were allowed to self-pollinate.
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   Both  purple-flowered plants and white-flowered plants appeared in the
   F[2] generation, in a ratio of about 3 purple : 1 white.
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   Similar ratios were observed in other pea characters (traits).
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   Mendel  called  the purple flower trait dominant, and the white flower
   color trait recessive.