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Mom and Dad Both Have Type a Blood

Question 56

Multiple Choice

Mom and Dad both have type A blood.Their first child has type O blood.What does this tell us about Mom and Dad?


A) One of them must have an O gene.
B) Both of them must have an O gene.
C) One of them must be heterozygous type A.
D) Both of them must be homozygous type A.

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