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BMAT考試：科學(xué)知識(shí)與應(yīng)用練習(xí)
A woman has a recessive genetic condition butneither of her parents has the condition.
Which one of the following could not be true?
A ?Both herparents are heterozygous for this gene.
B ?Onematernal grandparent and one paternal grandparent have the condition.
C ?Onematernal grandparent and one paternal grandparent are heterozygous for thisgene.
D ?All hergrandparents were carriers of the recessive allele.
E ?Bothparents are homozygous and a mutation occurred in the DNA of a gamete from oneof her parents.
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