According to the trichromatic theory of color vision people who have red-green color blindness have:
A)far fewer cones than people with normal color vision.
B)normal red-sensitive cones, but lack blue-sensitive cones.
C)normal blue-sensitive cones, but their other cones are sensitive to either red or green but not both.
D)color receptors that are limited to the blue-yellow opponent pair.

Question

Quizplus · Accepted Answer

The trichromatic theory of color vision proposes that there are three types of color receptors or cones in the retina, sensitive to either red, green, or blue. People with red-green color blindness have a genetic mutation that causes their red and green cones to have overlapping sensitivity or be absent altogether, while their blue-sensitive cones are still functional. Therefore, they have normal blue-sensitive cones, but their other cones are sensitive to either red or green but not both.

According to the Trichromatic Theory of Color Vision People Who