As discussed during week 4, the CCR5A32 mutation provides an example of balancing selection because heterozygotes are more resistant to smallpox than CCR5432 homozygotes or wild type homozygotes. CCR5 is a chemokine receptor that plays a role in immune responses against many pathogens. Reflecting this general function, CCR5A32 homozygotes have increased susceptibility to West Nile Virus. CCR5 also functions as a receptor for HIV, and CCR5A32 homozygotes are resistant to AIDS. Which of the following genetic phenomena is illustrated by this information about the CCR5 gene? Choose the one that is most clear-cut, and justify your choice with 1-2 sentences demonstrating an understanding of the phenomenon you chose.

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