Matching mitosis events to specific stages

Steps:

• Centromeres separate when sister chromatids pull apart toward opposite poles.
• Chromosomes become shorter and thicker during condensation.
• The first event occurs in anaphase; the second in prophase.
• Choice B pairs these stages correctly.

Why B is correct:

• In anaphase, centromeres divide as microtubules shorten, separating chromatids; in prophase, chromosomes condense via coiling, appearing shorter and thicker.

Why the others are wrong:

• A: Interphase precedes mitosis with no centromere separation or chromosome condensation.
• C: Metaphase aligns chromosomes but does not separate centromeres; interphase lacks condensation.
• D: Metaphase involves alignment, not centromere separation; prophase is correct but mismatched.

Final answer: B