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Gaokao Biology Practice Question

下列关于人类猫叫综合征的叙述,正确的是( )

  1. A.该病是由于特定的染色体片段缺失造成的
  2. B.该病是由于特定染色体的数目增加造成的
  3. C.该病是由于染色体组数目成倍增加造成的
  4. D.该病是由于染色体中增加某一片段引起的

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