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A cell arrested at the G2 checkpoint has most likely failed to

  • A.complete DNA replication correctly
  • B.reach a large enough overall size
  • C.attach its chromosomes to the spindle
  • D.separate its two daughter cells

Answer: A

The G2 checkpoint tests whether replication finished and whether the DNA is intact before mitosis begins. Size is assessed at G1 and spindle attachment during mitosis itself. Each checkpoint guards the step immediately after it.

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