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

His mother exhibited the trait
His mother had at least one allele

1 Answer

6 votes
I would go with "His mother exhibited the trait", since there is a 100% chance of him having the trait vs "His mother had at least one allele" which is 50% chance of him having the trait.
User Jmichalicek
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