<prompt> Which of the following is a Polygenic disorder:Cystic fibrosisPhenylketonuriaMultiple sclerosisHypertension  <response>: d. HypertensionRef: Nelsons 20e p 650, Ghai 8e p 643Polygenic disorders:Disorders caused by interactions between variant forms of genes and environmental factors.Occur when many polymorphisms, each with a modest effect and low penetrance, are co-inheritedE.g. HypertensionQ, Diabetes mellitus, Coronary Artery disease, Septal DefectsQ, Cleft lip 