本题目来源于试卷: SL/HL Topic D3.2 Inheritance，类别为 IB生物学
[单选题]
5. Phenylketonuria (PKU) is4v)t*vwrxrz2; kqtxu g. - pu9 an inherited human disease ct flzso*+-j +zsx -z0 khz5f,caused by a recessive autosomal allele in a gene which codes for an enzyme needed to convert phenylalanine to tyrosine. jl-h+k5c*ts0-z sz ,x zof+zfThe PKU allele produces a non-functional enzyme.
Which of the following statements are correct?
I. Two parents heterozygous for the condition could have a child with PKU.
II. If the mother of the child is homozygous and not affected by PKU, her children will not be affected.
III. The polypeptide sequence of the enzyme of an affected person is identical to a person without the condition.
IV. Two parents who are not affected with PKU cannot have a child with the disorder.
A. I, II and IV only
B. II and III only
C. I and II only
D. I, III and IV only
参考答案: C
本题详细解析:
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