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AIIMS AIIMS Solved Paper-2009

  • question_answer
    This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree?

    A) Autosomal recessive     

    B) Autosomal dominant

    C) Y-linkage

    D) Sex linked recessive

    Correct Answer: C

    Solution :

    Y-linked disorders are caused by mutations on the Y-chromosome. Because males inherit a Y-chromosome from their fathers, every son of an affected father will be affected. Because females inherit an X-chromosome from their fathers, female offspring of affected fathers are never affected.


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