Question

What is a polymorphic trait? Provide two examples of polymorphic traits in modern humans.

Answer 1

Polymorphism is a discontinuous genetic variation resulting in the occurrence of several different forms and types of individuals among the members of a single species.

examples: (in human)

1. All the basic blood classifications(blood groups), for example, the ABO blood group systems are hereditary polymorphisms. Here we see a framework where there are more than two transforms: the phenotypes A, B, AB and O are available in every human populace, however, change in extent in various parts of the world. The phenotypes are controlled by numerous alleles at one locus. These polymorphisms are apparently never disposed of by characteristic choice.

2.The genes of the major histocompatibility complex (MHC) have highly polymorphic characteristics which play an important role in resistance to infectious pathogens.