Genetic disorders

DIAGRAM TO BE ADDED

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  • Genetic disorders
    • Cystic fibrosis is caused by a recessive allele
      • 1) cystic fibrosis is a genetic disorder of the cell membranes
      • 2) It's caused by a faulty recessive allele of a single gene 'f'
      • 3) Because it's recessive, people with only one copy of the allele won't show the symptoms of the disorder
      • 4) for a child to have a chance of inheriting the disorder, both parents must be carriers or sufferers
      • 5) as the diagram shows, there's a 1 in 4 chance of a child having the disorder if both parents are carriers
      • DIAGRAM NEEDED
    • Ptolydactyly is caused by a dominant allele
      • 1) Polydactyly is a genetic disorder where a baby's born with extra fingers or toes
      • 2) it's cause by a faulty dominant allele of a single gene 'D'
      • 3) So polydactyly can be inherited if just one parent carriers the faulty allele
      • 4) The parent that has the faulty allele will be a sufferer too, since the allele is dominant
      • 5) as the diagram shows, there's a 50% chance of a child having the disorder if one parent has the 'D' allele
      • DIAGRAM NEEDED

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