8. Prophase
• First and longest phase of mitosis, during
which the chromosomes become visible
and the centrioles separate and take up
positions on the opposite sides of the
nucleus.
9. Centriole
• One of two tiny structures located in the
cytoplasm of animal cells near the
nuclear envelope.
11. Metaphase
• Second phase of mitosis, during which
the chromosomes line up across the
center of the cell.
12. Anaphase
• The third phase of mitosis, during which
the chromosome pairs separate and
move toward opposite poles.
13. Telophase
• Fourth and final phase of mitosis, during
which the chromosomes begin to
disperse into a tangle of dense material.
14. Key Concept
• What are the main events of the cell
cycle?
–During the cell cycle, a cell grows,
prepares for division, and divides to
form two daughter cells, each of which
then begins the cycle again.
15. Key Concept
• What are the four phases of mitosis?
–Biologists divide the events of mitosis
into four phases: prophase,
metaphase, anaphase, and telophase.