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
Definitions:
Consistency Effect
The tendency for people to seek, interpret, and remember information that confirms their preexisting beliefs and attitudes.
Superimposing
The process of laying or placing one thing over another, typically in a way that both are still evident, often used in visual arts or image processing.
Direct Perception Checking
Asking the observed person to confirm an interpretation or a perception about him or her.
Uncertainty Reduction
The process of acquiring information to reduce the level of uncertainty or unfamiliarity in interactions, especially in initial encounters.
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