The evolution of the MHC polymorphism ensures that a population will not succumb to a new pathogen or a mutated one , because at least some individuals will be able to develop an adequate immune response to win over the pathogen .
The evolution of the MHC polymorphism means that a population will not succumb to a new pathogen or a mutated one , because at least some individuals will be able to develop an adequate immune response to defeat the pathogen .