Huntington’s disease, a neurodegenerative genetic disorder that typically becomes noticeable in middle age, is due to an autosomal dominant allele. Sickle cell anemia, on the other hand, is a genetic blood disorder due to a recessive allele. Mary is a carrier of the allele for sickle cell anemia but has no sign of any neurodegenerative disorder in her family. She married Paul whose father died of Huntington’s disease. His mother, however, is not inflicted with that condition. Neither of his parents exhibits sickle cell anemia.     What are the genotypes of Jane and Paul? If they plan to have four children, what is the probability that:  all their children will be normal?  _________________________________   they will have a son with Huntington’s disease? _________________________   they will have a daughter inflicted with both conditions?________________

Human Anatomy & Physiology (11th Edition)
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Huntington’s disease, a neurodegenerative genetic disorder that typically becomes noticeable in middle age, is due to an autosomal dominant allele. Sickle cell anemia, on the other hand, is a genetic blood disorder due to a recessive allele. Mary is a carrier of the allele for sickle cell anemia but has no sign of any neurodegenerative disorder in her family. She married Paul whose father died of Huntington’s disease. His mother, however, is not inflicted with that condition. Neither of his parents exhibits sickle cell anemia.

 

  1.   What are the genotypes of Jane and Paul?
  2. If they plan to have four children, what is the probability that: 

    • all their children will be normal?  _________________________________

     

    • they will have a son with Huntington’s disease? _________________________

     

    • they will have a daughter inflicted with both conditions?________________

     

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