David has a color deficiency because he has a missing cone pigment. He is considered to be a
A) dichromat.
B) monochromat.
C) anomalous trichromat.
D) tetrachromat.

Question

Quizplus · Accepted Answer

David is missing one of his cone pigments, which means he can see some colors but not others. This type of color deficiency is known as dichromatism. Monochromatism would mean he only sees in black and white, which is not the case here. Anomalous trichromats have all three cone pigments, but one is abnormal, which does not match David's situation. Tetrachromats have an extra cone pigment, which is not relevant to David's situation either.

David Has a Color Deficiency Because He Has a Missing