Inherited disorders

• what are 2 types of inherited disorder

  • polydactyly
  • cystic fibrosis
• what is polydactyly caused by

  dominant allele
• what is polydactyly

  a disorder where a person has extra fingers or toes
• who would develop polydactyly

  someone who is homozygous or heterozygous for the dominant allele
• fill in the diagram

  :

  A) polydactyly

  B) polydactyly

  C) normal

  D) possible gametes

  
• how many alleles does the offspring need to carry from the parent to inherit polydactyly

  1
• what is cystic fibrosis

  a disorder of cell membranes resulting in thick mucus in airways or pancreas
• what is cystic fibrosis caused by

  recessive allele (on chromosome 7)
• how many copies does the offspring need to inherit from the parents to be born with cystic fibrosis

  2, one from each parent
• fill in the diagram

  :

  A) mother

  B) father

  C) FF

  D) FF

  E) Ff

  F) Ff

  
• what is embryo screening

  a process that allows scientists to observe whether the child will have a genetic condition or not
• what are some pros of embryo screening

  • reduces number of people suffering (ethical)
  • treating disorders can be expensive (economic)
  • many regulations in place to stop it from getting out of hand
• what are some cons of embryo screening

  • could encourage the making of "designer babies" (ethical)
  • expensive to carry out (economic)
  • could promote prejudice since it suggests that those with genetic disorders won't live a full life or are unwanted (social)
  • decisions about terminating a pregnancy have to be made (social)
  • procedure could lead to miscarriage (social)