Pedigrees for Traits that are Controlled by a Single Gene Essay Assignment Paper

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Pedigrees for Traits that are Controlled by a Single Gene Essay Assignment Paper

While most human traits are controlled by more than one gene, a subset of them are controlled by a single gene for that trait. In such cases, the pedigree can be useful in determining the mode of inheritance, such as autosomal dominant, autosomalrecessive, or X-linked recessive. The document Pedigrees.pdf **  contains the pedigree for three different traits from the same family: Trait 1, Trait 2 and Trait 3. In each pedigree, individuals with the trait are shaded. These pedigrees follow the usual conventions for pedigrees: squares are males; circles are female; offspring are drawn under each mating pair. See book for details.

• (a) Which of the three traits (Trait 1, Trait 2, Trait 3) follows an X-linked recessive pattern of inheritance?
• (b) Which clues from the pedigree support your conclusion?

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