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An Infant with Type B Blood Is Born to Parents

Question 6

Multiple Choice

An infant with type B blood is born to parents who both have type O blood. What genetic action or phenomenon is responsible for this unusual blood type expression?


A) Decreased penetrance of a dominant trait
B) Variable expressivity of a recessive trait
C) Inactivation of both parents' X chromosomes
D) Failure of one parent's blood-type gene alleles to segregate

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