Lisa Has a Rare Genetic Defect That Causes Acute Sun-Sensitivity

Essay

Lisa has a rare genetic defect that causes acute sun-sensitivity.Her mother has the defect,but her father does not.All of Lisa's siblings,two brothers and a sister,are also affected.All four siblings are married,but none of their spouses has the mutant gene.Draw a pedigree for this family.Identify and explain the most likely mode of transmission for this disorder.