1. CELL CYCLE

2. How many cells do we begin with?

3. 2

4. How do we get more?

5. Cell Cycle

6. INTERPHASE

7. G1 PHASE
“gap 1” Phase
period when cell growth and development occur

8. S PHASE
“synthesis” Phase
DNA replication / synthesis occurs

9. G2 PHASE
“gap 2” Phase
when organelles needed in cell division are made (centrioles, spindle fibers)

10. CHROMOSOME
structure that contains genetic information (usually visible only in mitosis)

11. The set of 46 human chromosomes

12. the two identical parts on a chromosome
CHROMATIDS
the two identical parts on a chromosome

13. CENTROMERE
The middle part of the chromosome that holds together the sister chromatids

16. MITOSIS

17. GOAL OF THE CELL CYCLE to create a new somatic cell exactly like the parent

18. MITOSIS process by which the nucleus of a cell is divided into two nuclei, each with the same number of chromosomes as the parent cell

19. 1. PROPHASE The longest phase Chromosomes appear
Centrioles move to opposite ends of the cell
Chromosomes attach to the spindle
Nucleolus and nuclear membrane breaks down

20. PROPHASE (cont…) The longest phase Chromosomes appear
Centrioles move to opposite ends of the cell
Chromosomes attach to the spindle
Nucleolus and nuclear membrane breaks down

21. 2. METAPHASE Shortest phase of mitosis
Chromosomes line up at center of the cell

22. 3. ANAPHASE Centromeres split
Sister chromotids separate to form individual chromosomes
Anaphase ends when the movement of chromosomes stops

23. 4. TELOPHASE Chromosomes uncoil into chromatin
Nuclear membrane reforms
Spindle breaks apart

24. CYTOKINESIS The cytoplasm of the cell divides
Forms two daughter cells that are exactly like the parent cell (each have one complete set of chromosomes)

25. Meiosis
The process of cell division so that each new cell has 1/2 the number of chromosomes as the original.