• The inheritance of characteristics is not always as simple as it is for the characteristics that Mendel studied in pea plants.
  • Each characteristic Mendel investigated was controlled by one gene that had two possible alleles, one of which was completely dominant to the other.
  • This resulted in just two possible phenotypes for each characteristic.
  • Many genes have multiple (more than two) alleles.
  • Skin color and adult height are examples of polygenic characteristics in humans.
  • Do you have any idea how many phenotypes each characteristic in humans has?
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