Topic 7.2 - Genetic Diseases

  • Some disorders are inherited:
    • Polydactyly (having extra fingers or toes) is caused by a dominant allele and can therefore  be passed on by only one parent who has the disorder
    • Cystic Fibrosis (a disorder of the cell membranes) is caused by a recessive allele and must therefore be inherited from both parents
      • It can be passed on by parents who may be carriers of the disorder without actually having the disorder themselves
    • Sickle-cell Anaemia (a disorder affecting red blood cells) is caused by a recessive allele.  
      • People who are heterozygous for the…


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