Inherited Disorders

• What type of disorder is cystic fibrosis?

  Genetic disorder of the cell membranes
• What causes cystic fibrosis?

  It is caused by a recessive allele
• What are the genotypes associated with cystic fibrosis?

  • Cystic Fibrosis (FF)
  • Carriers (Ff)
  • Unaffected and not carriers (ff)
• What is a family tree in genetics?

  A type of genetic diagram
• What are the probabilities for the new baby in the family tree?

  25% 50% 25%
• What is polydactyly?

  A genetic disorder with extra fingers or toes
• What causes polydactyly?

  It is caused by a dominant allele
• What is the chance of a child having polydactyly if one parent has one allele?

  50% chance of having the disorder
• What are the arguments against embryonic screening?

  • Screening is expensive
  • May lead to "desirable" selection
  • Implies genetic problems are "undesirable"
• What are the arguments for embryonic screening?

  • Helps to stop suffering
  • Reduces government treatment costs
  • Laws exist to regulate the process
• What is the topic of the study material?

  Inheritance, Variation and Evolution