How Could You Modify an Animal So That It Would

Question

How could you modify an animal so that it would distinguish more shades of green?
A)Induce genes to produce a greater number of cone cells in the fovea.
B)Introduce genes for different opsins that respond in the green region of the spectrum.
C)Introduce genes to produce green fluid in the eyeball, because green fluids will not absorb green light.
D)Induce increased production of cGMP to increase opening of cGMP-gated sodium channels.
E)Decrease the number of rods cells in the eye.

Accepted Answer

The ability to distinguish different shades of colors is based on the presence of different opsins in the retina. By introducing genes for opsins that respond to different wavelengths in the green region of the spectrum, an animal could distinguish more shades of green. Option A is also a possibility, but introducing more cones would not necessarily increase the ability to distinguish between different shades of green. Option C is not realistic as green fluids would not necessarily enhance the perception of green light. Option D is too specific to the mechanisms of rod cells and option E is not relevant to the perception of color.