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stefanmil
Can you explain how is this Kartagener? It didn't come to my mind at all :/ thanks
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kcd0321
I thought it was Cystic fibrosis: chronic cough with "thick" green sputum, cramps in the abdomen (malabsorption issues because of pancreatic insufficiency maybe), and then the frequent respiratory infections. Its also AR so the same principle of AA, Aa, or Aa, so he has a 2/3 chance of being a carrier.
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srmtn
isn't Aa or aA the same in terms of heterozygosity? I thought about that and put 1/2 :/
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chj7
@srmtn They represent two different events: getting the "bad" allele from the mom OR the dad. Thus, they individually contribute to the risk of being a carrier.
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Kartagener syndrome, an autosomal recessive ciliary disorder. Presents with triad of chronic sinusitis, bronchiectasis and situs inversus.
Since the brother is known to be phenotypically normal, he can either be AA, Aa or Aa. Thus, there is a 2/3 chance is a carrier.