1) (5 point question) Monkey\'s (new world) and primates (old world) have distin
ID: 206544 • Letter: 1
Question
1) (5 point question) Monkey's (new world) and primates (old world) have distinctly different vision. Most monkey's have dichromatic vision, while primates have trichromatic vision A) (2 points) What kind of mutation occurred in the primate lineage to allow the primates to have an extra opsin gene. B) (3 points) A recent discovery determined that the howler monkey has both L and M opsins on their X-chromosome similar to primates. Look at the diagram below that depicts the opsin locus on the x-chromosome of the howler monkey. How does this differ from the primate locus, and what might explain this difference? b Howler monkeys on LCR-on LCR https://www.researchgate.net/publication/280566766_Polymorphic Color Vision_in Pri mates-Evolutionary-ConsiderationsExplanation / Answer
Answer:
1. A. Primate color vision is based on two to three cone types in the retina, each expressing a different class of visual pigment, making them the only mammals that possess trichromacy.
Trichromacy was achieved differently in Old World and New World primates. In Old World primates, a duplication of the LWS opsin gene occurred giving rise to a “red-sensitive” or L pigment and a “green-sensitive” or M pigment.
Their corresponding L and M genes are adjacent on the X chromosome which, together with their high sequence homology, is the underlying cause for the high frequency of red-green color blindness seen in humans.
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