Human genetics is the study of heredity as it occurs in humans. Human genetics encompass a wide variety of overlapping fields, including classical genetics, cytogenetics, molecular genetics, biochemical genetics, genomics, desi genetics Genes are the common trait of most traits of inherited humans. The study of human genetics can answer the questions about human nature, can help us understand disease and the development of an effective treatment for the disease, and help us understand the genetics of human life. This article describes only the basic functionality of human genetics; for disorders of genetics, see: medical genetics.
Medical genetics is the branch of medicine that involves the diagnosis and management of hereditary disorders. Medical genetics is the application of genetics to medical care. It overlaps human genetics, for example, research on the causes and inheritance of genetic disorders would be considered within both human genetics and medical genetics, while the diagnosis, management, and counseling of individuals with genetic disorders would be considered part of medical genetics. Population genetics is the branch of evolutionary biology responsible for investigating processes that cause changes in allele and genotype frequencies in populations based upon Mendelian inheritance. Four different forces can influence the frequencies: natural selection, mutation, gene flow (migration), and genetic drift. A population can be defined as a group of interbreeding individuals and their offspring. For human genetics the populations will consist only of the human species. The Hardy–Weinberg principle is a widely used principle to determine allelic and genotype frequencies