[Campbell Biology P.288] During Anaphase, what is the primary event that leads to the moveme... | Practice Question

During Anaphase, what is the primary event that leads to the movement of chromosomes towards opposite poles?

  • A: Condensation of chromosomes.
  • B: Cleavage of cohesin proteins, allowing sister chromatids to separate.
  • C: Lengthening of nonkinetochore microtubules to push poles apart.
  • D: Formation of the cleavage furrow.

Explanation

Anaphase begins with the cleavage of cohesin proteins, which allows sister chromatids to suddenly part, becoming independent chromosomes. These new daughter chromosomes then move toward opposite poles as their kinetochore microtubules shorten.