题目内容

受精卵中的线粒体________

A.几乎全部来自精子
B.几乎全部来自卵子
C.精子与卵子各提供 1/2
D.大部分来自精子

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Leber 遗传性视神经病与白化病的遗传方式不同,前者表现为 ________。

A.孟德尔遗传
B.母系遗传
C.父系遗传
D.隔代遗传

下面对线粒体病不正确的描述是

A.母系遗传
B.最易发生于脑、肌等组织
C.母亲患病一定会传给子女
D.以点突变和缺失突变为主

Birth defects affect about 3% babies born in the United States each year. Which of the following birth defects is the most common one?

A. Spina Bifida
B. Club foot
C.Anencephaly
D.Cleft lip/palate
E.Down Syndrome

Which of the following cannot be explained by abnormal recombination?

A.point mutations
B.unbalanced translocations
C.inversions
D. deletions