Mrs. Deery is type "A" and Mr. Deery is type "O." They have three children named Sarah, Daniel, and Rebecca. Sarah is type "O," Daniel is type "A." and Rebecca is type "AB." Based on this information:What child cannot possibly be theirs?ResponsesDanielDanielRebeccaRebeccaSarah
Question
Mrs. Deery is type "A" and Mr. Deery is type "O." They have three children named Sarah, Daniel, and Rebecca. Sarah is type "O," Daniel is type "A." and Rebecca is type "AB." Based on this information:What child cannot possibly be theirs?ResponsesDanielDanielRebeccaRebeccaSarah
Solution
Rebecca cannot possibly be their child. This is because blood type is determined by two alleles, one from each parent.
Mrs. Deery has type A blood, which means she could have either AA or AO alleles. Mr. Deery has type O blood, which means he has OO alleles.
Their children could therefore have either AO (type A blood) or OO (type O blood) alleles.
However, Rebecca has type AB blood, which would require one A allele and one B allele. Since neither parent has a B allele, they could not have a child with AB blood. Therefore, Rebecca cannot be their child.
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