Question

1. using the key, categorize each of the events described below according to the phase in which it occurs. key: a. anaphase b. interphase c. metaphase d. prophase e. telophase 1. chromatin coils and condenses, forming chromosomes. 2. the chromosomes are v shaped. 3. the nuclear envelope re - forms. 4. chromosomes stop moving toward the poles. 5. chromosomes line up in the center of the cell. 6. the nuclear envelope fragments. 7. the mitotic spindle forms. 8. dna replication occurs. 9. centrioles replicate. 10. chromosomes first appear to be duplex structures. 11. cleavage furrow forms. 12. the nuclear envelope is completely absent. 13. what is the physical advantage of the chromatin coiling and condensing to form short chromosomes at the onset of mitosis?

Explanation:

1. Chromatin condensing into chromosomes occurs in prophase.
2. V - shaped chromosomes are seen in anaphase as sister chromatids are pulled to poles.
3. Nuclear envelope re - forms in telophase.
4. Chromosomes stop moving toward poles in telophase.
5. Chromosomes line up in the center in metaphase.
6. Nuclear envelope fragments in prophase.
7. Mitotic spindle forms in prophase.
8. DNA replication occurs in interphase.
9. Centrioles replicate in interphase.
10. Chromosomes first appear duplex in prophase.
11. Cleavage furrow forms in telophase.
12. Nuclear envelope is completely absent in metaphase and anaphase.

Answer:

1. d. prophase
2. a. anaphase
3. e. telophase
4. e. telophase
5. c. metaphase
6. d. prophase
7. d. prophase
8. b. interphase
9. b. interphase
10. d. prophase
11. e. telophase
12. c. metaphase, a. anaphase