• Mendel first experimented with just one characteristic of a pea plant at a time.
  • He began with flower color and cross-pollinated purple- and white-flowered parent plants.
  • He was surprised by the results.
  • This led to his law of segregation.
  • This law states that each characteristic is controlled by two factors, which separate and go to different gametes when an organism reproduces.
  • It states that there are two factors controlling a given characteristic, one of which dominates the other.
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