Question

what happens during anaphase?
the chromosomes align in the center of the cell.
the sister chromatids are pulled apart to opposite sides of the cell.
the chromosomes unravel.
the chromosomes condense, and the centrioles move toward opposite sides of the cell.

Explanation:

In anaphase of cell division, spindle fibers shorten. This causes sister chromatids (identical copies of chromosomes) to be separated. They are pulled to opposite poles (sides) of the cell. This ensures each new cell formed will get a complete set of chromosomes.

• "The chromosomes align in the center of the cell" occurs in metaphase.
• "The chromosomes unravel" happens in telophase.
• "The chromosomes condense, and the centrioles move toward opposite sides of the cell" is part of prophase.

Answer:

The sister chromatids are pulled apart to opposite sides of the cell.