In humans, two genes encoding the opsin visual pigmentsthat are sensitive to green and red wavelengths of lightare found adjacent to one another on the X chromosome.They encode proteins that are 96 percent identical.Nonprimate mammals possess just one gene encoding anopsin sensitive to the red/green wavelength.a. Offer one explanation for the presence of the twoopsin genes on the human X chromosome.b. How would you test your explanation further andpinpoint when in evolutionary history the second genearose?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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In humans, two genes encoding the opsin visual pigments
that are sensitive to green and red wavelengths of light
are found adjacent to one another on the X chromosome.
They encode proteins that are 96 percent identical.
Nonprimate mammals possess just one gene encoding an
opsin sensitive to the red/green wavelength.
a. Offer one explanation for the presence of the two
opsin genes on the human X chromosome.
b. How would you test your explanation further and
pinpoint when in evolutionary history the second gene
arose?

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