The following points highlight the top five criteria for genetic polymorphism. They are: 1. Selection 2. Mutation and Mutation Rates 3. Genetic Drift 4. Migration Pressure or Gene Flow 5. Meiotic Drive. Criteria # 1. Selection: Selection is the non-random or selective reproduction of genotypes. The elucidation of the selective forces which may have given rise to any particular polymorphism [...]
In this article we will discuss about the Introduction and hypothesis of human gene evolution. Introduction to the Evolution of Human Gene: Some chromosomes appear to have been relatively protected from change during primate evolution, for example human chromosome 19 and X. By contrast other chromosomes have been prone to significant reorganization for example human chromosomes 1, 2, 3 and [...]
Two types of mutagens are considered here which are mostly affected the humans producing different mutations resulting in a number of abnormalities: 1. Radiation Exposure 2. Chemical Mutagenesis. Type # 1. Radiation Exposure: High energy radiation or ionising radiation produces a genetic alteration or mutation at a very low dose also. It has been shown experimentally that a low dose [...]