Loci and alleles: There are multiple loci for the MHC genes, three for just the MHC class I genes, this would be polygenic. Each locus has different types of genes at the site in different people. The latter is called polymorphism. See this site for details. http://www.ncbi.nlm.nih.gov/books/NBK27156/
Answered 11/3/2015
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