Question

during which phase do chromosomes line up in the middle of the cell?
anaphase
metaphase
prophase
telophase

Explanation:

To solve this, we recall the stages of mitosis:

• Anaphase: Chromosomes separate and move to opposite poles.
• Metaphase: Chromosomes align at the cell's equator (middle).
• Prophase: Chromosomes condense, nuclear envelope breaks down.
• Telophase: Chromosomes decondense, nuclear envelope reforms.

So the phase where chromosomes line up in the middle is Metaphase.

Answer:

B. Metaphase (Note: Assuming the options are labeled as A. Anaphase, B. Metaphase, C. Prophase, D. Telophase. If the original labels differ, adjust accordingly, but the correct option is the one with "Metaphase".)