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【单选题】
遗传学是研究（ ）的学科。A.
DNA序列改变，且基因的表达也发生可遗传改变
B.
DNA序列不改变，且基因的表达也不发生可遗传改变
C.
DNA序列改变，而基因的表达不发生可遗传改变
D.
DNA序列不改变，而基因的表达发生可遗传改变
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