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BMAT考試：科學知識與應用練習

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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