“Cellular & Sexual Reproduction”
[Pages:20]"Cellular & Sexual Reproduction"
Class R2
Warm-up
Indicate whether the statement is true or false. 1. The cell cycle is divided into interphase and mitosis.
False. The cell cycle has three stages: interphase, mitosis, and cytokinesis. Identify the choice that best completes the statement or answers the question. 2. Why is the synthesis stage called this?
a. because protein synthesis is taking place b. because DNA synthesis is taking place c. because it combines several smaller stages into one d. because the chromosomes come together
B
Warm-up
3. DNA replication occurs during
a. anaphase.
c.
metaphase.
b. interphase.
d.
prophase.
B. During the second stage of interphase, called synthesis, a cell copies its DNA in preparation for cell division.
4. Why is it important for the chromosomes to condense during mitosis? a. to facilitate DNA replication b. to facilitate chromosome movement c. to facilitate cytokinesis d. to facilitate spindle formation
B. The decondensed chromosomes are so long and diffuse that they could not be disentangled when they are dragged to the poles of the dividing cell.
Warm-up
5. The typical growth period of a cell occurs during which stage of the cell cycle?
a. Gap 1
c.
synthesis
b. Gap 2
d.
Mitosis
A. The normal growth of the cell occurs in Gap 1 before the chromosomes are replicated.
Cell Division & the Cell Cycle
Cell Division and the Cell Cycle
Mitosis and Cytokinesis Objectives
? Describe the events of each stage of mitosis.
? Explain the process of cytokinesis.
Mitosis
You started life as a single cell. You now have trillions of cells in your
body. These new cells in your body came
from cell reproduction.
Phases of Mitosis
Mitosis - Sting
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