Inherited Disorders

• Inherited Disorders


  Disorders that can be inherited from parents
• New disorders can be inherited from your parents. Many of these can be screened for
• Certain disorders can affect the cell membranes, resulting in issues in the body
• Cystic Fibrosis


  Caused by a Recessive Allele
• The allele which causes cystic fibrosis is a recessive allele, P, carried by about 1 in 25 people
• To have the disorder, both parents must be either carriers or have the disease
• Cystic fibrosis results in sticky mucus in the air passages and in the pancreas
• Polydactyly


  Caused by a Dominant Allele
• Polydactyly is a genetic disorder where a baby is born with extra fingers or toes, which doesn't usually cause any other problems so isn't life-threatening
• Inheritance of Polydactyly


  1. The disorder is caused by a dominant allele, 'D', and so can be inherited if just one parent carries the defective allele

  2. The parent that has the defective allele will have the condition too since the allele is dominant

  3. There's a 50% chance of a child having the disorder if one parent has one D allele