Chromosome Distribution in Mitosis

Steps:

• Recall mitosis stages: prophase condenses chromosomes; metaphase aligns them at equator; anaphase separates sister chromatids to poles; telophase reforms nuclei; interphase prepares for division.
• Identify key events for equal distribution: alignment ensures positioning, separation ensures one chromatid per daughter cell.
• Evaluate choices: only metaphase and anaphase directly handle alignment and separation of chromatids.
• Confirm: this guarantees identical chromosome content in daughters.

Why B is correct:

• Metaphase aligns chromosomes at the equatorial plate for equal positioning; anaphase pulls sister chromatids to opposite poles, ensuring each daughter receives one full set per the mitotic spindle mechanism.

Why the others are wrong:

• A: Prophase condenses chromosomes but does not align or separate them.
• C: Telophase reforms nuclei after separation but misses alignment step.
• D: Interphase is not mitosis and involves DNA replication, not distribution; telophase follows separation without ensuring it.

Final answer: B