1. Cells & Heredity Chapter 2.3 Pages 61-68
Cell Division
Cells & Heredity Chapter 2.3
Pages 61-68
Begin class with overview of photosynthesis and respiration, showing video clips on United Streaming

2. The Cell Cycle Mitosis Cytokinesis Interphase
The sequence of growth and division of cells is called the Cell Cycle.
Consists of 3
main stages…
Mitosis
Cytokinesis
Interphase

3. Stage 1 - Interphase
Cell grows to maturity, completely forming its functional structures
Doubles in size
Copies its DNA in the nucleus via Replication
Cell prepares to divide.

4. Stage 2 - Mitosis
A copy of DNA is distributed to each of 2 daughter cells
Four Phases
Prophase
Metaphase
Anaphase
Telophase

5. Key Terms Chromatin: Material in cells that contain DNA
Chromosome: doubled rod of condensed chromatin
Chromatid: identical strands held together by a centromere.

6. 4. Telophase 1. Prophase 3. Anaphase 2. Metaphase
Chromosomes stretch out
Nuclear membrane forms
1. Prophase
Chromatin condenses to chromosomes
Spindle fibers form bridge
3. Anaphase
Chromosomes split as spindles retract
Cell begins stretching
2. Metaphase
Chromosomes align in center
Attach to spindle fibers

7. Stage 3 - Cytokinesis
Cytoplasm separates organelles as it divides into two cells
The membrane pinches off
Plant cells can not pinch, instead form a cell plate.

8. Round & Round
Duration of Cell Cycle varies on type of cell being created
Liver cells take 22 hours
Brain cells never divide.

9. What to Work On Read Section 2.3 in the textbook
Pages 61 to 68
Answer the Section Review questions
Page 68
Numbers 1 through 4.

10. What to Work On Complete the following Section Reviews Page 44, #1-4