When a gene carrying a third photopigment was introduced into photoreceptors of adult male squirrel monkeys with dichromatic vision, the monkeys
A) gained the ability to discriminate short-wavelength stimuli (blue) from long-wavelength stimuli (not blue).
B) lost the ability to discriminate short-wavelength stimuli (blue) from long-wavelength stimuli (not blue).
C) gained trichromatic vision.
D) gained yellow-blue discrimination.

Question

Quizplus · Accepted Answer

The introduction of the gene carrying a third photopigment allowed the monkeys to gain trichromatic vision, which means they are now able to discriminate short-wavelength stimuli (blue) from long-wavelength stimuli (not blue), as well as the additional ability to distinguish between colors in the yellow-green range.

When a Gene Carrying a Third Photopigment Was Introduced into Photoreceptors