polymorphism (genetics) 《英文msh词典》Polymorphism (Genetics) ; [主题词] Polymorphism (Genetics) ; [入口词] Polymorphism ; [入口词] Polymorphisms ; [入口词] Polymorphisms (Genetics) ; [英文释义] The regular and simultaneous occurrence in a single interbreeding population of two or more discontinuous genotypes. The concept includes differences in genotypes ranging in size from a single nucleotide site (POLYMORPHISM,SINGLE NUCLEOTIDE) to large nucleotide sequence visible at a chromosomal level.