Question

what happens during metaphase?
a. chromosomes separate from one another.
b. chromosomes line up single file down the middle of the cell.
c. chromosomes become visible.
d. all of the above

Explanation:

Metaphase is a stage of cell division where chromosomes align at the cell's equatorial plane (metaphase plate). Option A describes anaphase, option C describes prophase, so only B is correct.

Answer:

B. Chromosomes line up single file down the middle of the cell.