Studies have shown the MHC gene gives off a scent. The scent is used as a factor in how people choose their mates. If one person’s MHC is too similar to another’s, the MHC will act as a repellent. The scent of MHC that is sufficiently different will act as a magnet. This is significant from several perspectives. For one, it shows the unconscious drive for a certain level of diversity, given that diverse couplings provide to offspring a broader set of abilities.
