Definition of genetic variability: The human genome.Genetics test: diagnostics test, screening test, preclinicals test, predictives test, pharmacogenomics test.Psychosocial issues related to genetic tests. Genetic privacy: risks of dissemination of genetic data. Genetics bases of cancer : counseling, hereditary tumors. Psychological problemsGenetic bases of the sexual differentiation: analysis of genetic diseases in disorders of sexual differentiation. Genetic and environmental bases of infertility: assisted fertilization techniques. Psychological problems.Forensic genetics: paternity analysis,identification of perpetrators, identification of victims of crimes or claims. Psychological problemsGenetic bases of aggression. Social problems.Alzheimer's disease: genetic bases and social problemsHuntington's disease: genetic bases and social problem