Genetic studies have identified an allele ($\Delta$32) that seems to provide protection against HIV. Which of the following would MOST likely explain the reason why our population has this mutation?

Question

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The presence of the protective allele suggests that it was already present in the human population before the emergence of HIV. It is likely that this allele provided protection against some other related pathogen, which was not necessarily a retrovirus like HIV.

Genetic Studies Have Identified an Allele Δ\DeltaΔ 32) That Seems to Provide Protection Against HIV

Genetic Studies Have Identified an Allele $\Delta$ 32) That Seems to Provide Protection Against HIV