1. Chapter 10-2: CELL CYCLE
HI!!!
M Phase

2. I. INTERPHASE(G1, S & G2) Cell Cycle begins here
The cell is NOT dividing
The cell is doing work and growing.
Once the cell starts getting too big or a new cell is needed, it begins preparing for cell division.
1. One of the things the cell does to prepare for dividing is to replicate the DNA. (an exact copy of each strand is made and the single stranded chromosomes become double stranded chromosomes made of sister(twin) chromatids.)
**Why does this need to happen?

3. Interphase

4. II. M-Phase: Same as “cell division”
A. SOMATIC (body) cells are made
Includes 2 parts (that overlap)
Mitosis: Division of the nucleus of somatic cells.
Has 4 Phases (PMAT)
Cytokinesis: Division of the cytoplasm
Ends with 2 (identical) Cells

5. B. MITOSIS
1. Prophase
During this phase, the nuclear membrane dissolves so the 2-sets of DNA can eventually separate!

6. Prophase

7. 2. METAPHASE
a. Both sets of DNA line up in Middle (equator) of the cell.
b. Each chromosome “X” is made of one original DNA strand and it’s exact copy.
c. In this structure each strand of the chromosome is called a sister chromatid.

8. Metaphase

9. 3. ANAPHASE
Centromeres split allowing (twin)sister chromatids to separate
b. The chromatids separate (becoming single stranded chromosomes) and move Away from each other until they reach opposite ends of the cell.
Why do you think this happens?
What do you think happens next?

10. Anaphase

12. 4. TELOPHASE a. New nuclear envelopes reappear around each set of DNA
b. There are now two completely identical nuclei inside one cell.
***Mitosis (division of the nucleus) is complete

13. Telophase

14. B. CYTOKINESIS: Second Stage of “Cell Division”(M-Phase)
Division of Cytoplasm
Cytokenesis in Animal Cells
Cell membrane pinches inward until the cytoplasm is completely divided into two separate cells.
Once cytokenesis is complete, there are two identical cells.

15. Cytokinesis- finished

17. PROPHASE
METAPHASE
INTERPHASE
USE
CHROMOSOME COLORS FROM YOUR BOOK!
TELOPHASE
ANAPHASE
CYTOKINESIS