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    The diagram shows a pedigree of cystic fibrosis, in which the black colour indicates the presence of cystic fibrosis.

    Question
    SLPaper 1A

    The diagram shows a pedigree of cystic fibrosis, in which the black colour indicates the presence of cystic fibrosis.

    What is the probability that the individual labelled XXX is a carrier of cystic fibrosis?

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