BotanyIn the following human pedigree, the filled symbols represent affected individuals. Identify the type of disorder represented in the pedigree chart.

In the following human pedigree, the filled symbols represent affected individuals. Identify the type of disorder represented in the pedigree chart.

Image result for pedigree autosomal recessive

  1. A

    Autosomal dominant

  2. B

    Autosomal recessive

  3. C

    X-linked recessive

  4. D

    Y-linked recessive 

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    Solution:

    The trait is seen in the first generation and the third generation but not in the second generation. Only recessive traits skip generations but not dominant traits. Had the trait been X-linked recessive,  the males of the second generation would have been affected since their mother is affected. Y-linked traits are expressed only in males.

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