1. Topic 5 Cell Division

2. What are some reasons that cells typically divide?
Growth
Repair/replacement
to reproduce

3. Circle one: The longest phase of the cell cycle is INTERPHASE / M phase

4. G1 is about cell __growth__.

5. How does a duplicated strand of DNA end up being identical to the original strand?
In DNA replication one strand serves as a template for a new strand to be made, resulting in two DNA strands each with one old and one new strand.

6. The last stage of Interphase is G2.

7. In mitosis, the goal is to get cells that are genetically __identical __That is, we want to go 2N2N.

8. Match the following Mitosis stages to what happens
C--Prophase a. Chromosomes move to opposite ends of cell
D---Metaphase b. Nucleus reforms, DNA loosens, last stage
A---Anaphase c. DNA condenses; nuclear breaks down
B--Telophase d. Chromosomes line up in middle of cell

9. What is the difference between plant and animal cytokinesis?
In cells without walls (animal
cells ), it is accomplished by
pinching of the cell. In plant
cells, the wall prevents
pinching; instead a new cell
wall forms.

10. What does meiosis do to the number of chromosomes?
Reduces the number of chromosomes by half, diploid cells become haploid

11. Meiosis goes from 2N N, or from diploid  haploid.

12. What is crossing over?
process in which homologous chromosomes exchange pieces of their chromatids

13. When does crossing over happen?
Prophase I