Identify two mechanisms of evolution

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In humans (and other mammals), the major histocompatibility complex of proteins (MHC) plays a vital role in the immune system. When cells are infected by a bacteria or virus, they respond by displaying pieces of viral or bacterial protein on their surfaces to indicate that the cell is infected and should be taken care of by the immune system. It is the MHC that is involved in binding the bacterial or viral protein at a recognition site. The frequency of different non-synonymous substitutions at the MHC locus varies geographically across human populations. Identify twomechanisms of evolution that may be influencing the variation in the MHC locus and briefly explain how they would cause variation among human populations

Reference no: EM132738147

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