Mendelian Genetics

AP Biology· difficulty 2/5

The pedigree below tracks an autosomal trait across three generations. Filled symbols indicate affected individuals; squares are males, circles are females.

The trait is most likely:

  • A

    Y-linked

  • B

    Autosomal dominant

  • C

    X-linked dominant

  • D

    Autosomal recessive

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Explanation

Two unaffected parents (gen II) produce an affected daughter; the trait skips a generation, consistent with autosomal recessive inheritance. Both sexes are affected, ruling out Y-linked.

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