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BMAT考试：科学知识与应用练习
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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