Inherited disorders

• What are three symptoms of cystic fibrosis?

  Thick, sticky mucus in the air passages
• Which allele type causes cystic fibrosis?

  Recessive
• What is a carrier?

  Someone who only has one copy of the effected allele
• What is polydactyly?

  A genetic disorder where a baby is born with extra fingers or toes
• Which allele causes polydactyly?

  Dominant
• What is the chance of getting polydactyly if one parent has the dominant allele?

  50%
• What is the chance of getting cystic fibrosis is both parents carry the allele?

  25%
• How can genetic disorders be detected?

  Embryo screening
• What is embryo screening?

  Screening embryos to see if they have the alleles of specific characteristics
• Why is embryo screening unpopular?

  There are ethical, social and economic concerns
• Name 3 reasons for embryo screening

  Stops people suffering, treating disorders costs a lot of money, there are laws to stop it going too far
• Name 3 reasons against embryo screening

  Increase prejudice, stop selective breeding, screening is expensive