Depression as a genetic medical illness, assertions from society’s appointed experts; what are genes?; what are genetic disorders?; gene mutation; the criteria for a genetic disease; a typical verified medical genetic disease; genetic testing; what genetic research into depression has found; why no genetic tests are carried out in relation to depression; does depression meet the criteria for a genetic disorder?; the validity of “genetic vulnerability”; the truth about depression and genetics; twin and adoption studies; doctors’ bias towards biology, and why.