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The point at which two homologous chromatids are joined during crossing over is a

  • A.centriole
  • B.chiasma
  • C.centromere
  • D.kinetochore

Answer: B

The chiasmata are visible under the microscope and hold the homologues together until anaphase I. Their number varies, but at least one per pair is generally needed for correct segregation. Chiasmata are the physical evidence that crossing over has taken place.

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