Blue light is a portion of the visible spectrum that penetrates deep into bodies of water.Ultraviolet (UV)light,though,can penetrate even deeper.A gene within a population of marine fish that inhabits depths from 500 m to 1,000 m has an allele for a photopigment that is sensitive to UV light and another allele for a photopigment that is sensitive to blue light.Which of the graphs in Figure 21.1 best depicts the predicted distribution of these alleles within a population if the fish that carry these alleles prefer to locate themselves where they can see best? Figure 21.1
A)A
B)B
C)C

Question

Blue light is a portion of the visible spectrum that penetrates deep into bodies of water.Ultraviolet (UV)light,though,can penetrate even deeper.A gene within a population of marine fish that inhabits depths from 500 m to 1,000 m has an allele for a photopigment that is sensitive to UV light and another allele for a photopigment that is sensitive to blue light.Which of the graphs in Figure 21.1 best depicts the predicted distribution of these alleles within a population if the fish that carry these alleles prefer to locate themselves where they can see best?  Figure 21.1
A)A 
B)B 
C)C

Quizplus · Accepted Answer

Since UV light penetrates deeper into water than blue light, the fish with the allele for UV sensitive photopigment will have an advantage in locating themselves where they can see best. Therefore, over time, the frequency of the UV-sensitive allele should increase in the population compared to the blue-sensitive allele. This is depicted by the shift in the graph towards the right in option B, which shows higher frequency of the UV-sensitive allele at deeper depths.

Blue Light Is a Portion of the Visible Spectrum That