1. CELL CYCLE
                              

2. CELL REPRODUCTION
What are the three parts of the cell theory?
Cell division-produce new cells from one cell
Explain two reasons WHY cell division is required?
Maintain proper surface-to-volume ratio
Replace cells that die

3. CHROMOSOMES
Structures that contain DNA
Carries genetic material
Exist as chromatin- long strands of DNA wrapped around proteins called histones
Packs together before a cell divides

4. CHROMOSOMES

7. Growth in a Cell CELL CYLCE- sequence of growth & division in a cell.
2 general periods
Growth-majority of a cell’s life
Interphase-
Division
Mitosis- two daughter cells are formed

8. Interphase
Cell performing duty in the tissue
Growing
DNA synthesis
Copies chromosomes
Prepares for cell division

9. Mitosis
Occurs when maximum cell size is reached
Four phases
Prophase
Metaphase
Anaphase
Telophase

10. PROPHASE
1ST phase & longest phase
Chromatin coils into chromosomes
Made up of 2 halves-sister chromatids
Held together by a centromere

11. METAPHASE
2ND phase
Double chromosomes attach to spindle fibers
Lineup on the midline of cell

12. ANAPHASE
3RD phase
Chromosomes separate and move to opposite sides of the cell.

13. TELOPHASE
4TH & final phase
Chromatids reach opposite sides
Chromosomes unwind
Membrane begins to form
Cytokinesis begins

14. CYTOKINESIS=Cell divides
Plants
Cell plate laid down
Animals
Plasma membrane pinches