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    Sex-linked Genetic traits

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    Predict the parental genotypes for individuals expressing the dominant or the recessive trait. What sex generally expresses the recessive trait? Why?

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    Solution Preview

    Sex-linked traits are those carried on either the X or Y chromosome. Because females have two X chromosomes and males have XY the frequency of the trait is different from autosomal traits and is influenced by the sex of the organism.

    For example, let's say a trait is dominant (A) and X-linked (this means that an individual only needs to inherit one copy of the dominant allele to express the trait).
    XAXa x XaY
    XA Xa
    Xa XAXa XaXa
    Y XAY ...

    Solution Summary

    Detailed explanation of how to predict if a trait is dominant, recessive, and/or sex-linked. Web references provided.