Biology, 30.11.2020 22:10 kell22wolf

If a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true? His mother exhibited that trait.
His father exhibited that trait.
His father’s mother carried an allele for that trait.
His mother carried at least one allele for that trait.

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