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12 February, 00:03

F a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true?

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  1. 12 February, 00:23
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    If a boy exhibits a sex-linked trait that is carried on the X chromosomes, his mother carried at-least one allele for that trait.

    The boy has a X chromosome inherited from his mother and he inherited Y chromosome from his father. So, his mother must carried at least one allele for that trait because he exhibits a sex linked trait that is carried on X chromosome.
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