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Anomalous trichromacy differs from dichromacy in that an anomalous trichromat

  • A.has three cone types but one with a shifted sensitivity
  • B.has only two functioning cone types altogether in the retina
  • C.has four distinct cone types rather than three
  • D.has no functioning cone types whatever

Answer: A

Discrimination is reduced rather than absent along the affected axis. A dichromat by contrast is missing one cone type entirely. Reduction differs from absence in degree. An anomalous trichromat retains three cone types.

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