1. Cell Division and Reproduction
Mitosis and Meiosis
Cell Division and Reproduction

2. MITOSIS Process of one cell making two new identical daughter cells
Both new cells will have the same number of chromosomes as the original cell
Both new cells will have the same DNA code as the original cell

3. Phases of Mitosis – an overview
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
(Create a mnemonic for IPMATC)

4. MITOSIS
INTERPHASE: Cell is preparing to divide, nucleus visible but no chromosomes are visible, cell grows and DNA is duplicated

5. MITOSIS
PROPHASE: Nuclear membrane disappears, DNA condenses into chromosomes and becomes visible inside cell

6. MITOSIS
METAPHASE: Spindle fibers form at opposite sides of chromosomes; chromosomes line up in center of cell

7. MITOSIS
EARLY ANAPHASE: Spindle fibers attach to chromosomes; pull one chromosome set to each side of cell

8. MITOSIS
LATE ANAPHASE: Chromosomes are at opposite sides of the cell; spindle fibers disappear

9. MITOSIS
TELOPHASE: Chromosome sets assemble at opposite poles and a nuclear envelope reforms around each set.

10. Mitosis
CYTOKINESIS: Cytoplasm fully divides and two new cells are formed. Each new cell is ½ the size of the original cell.

11. MITOSIS
One large cell makes two smaller cells with same number of chromosomes; allows organisms to grow

12. MEIOSIS One large cell will produce 4 smaller cells
Each cell will have ½ the normal number of chromosomes
The cells produced during meiosis will fuse together during sexual reproduction
May be called egg and sperm or + and -

13. MEIOSIS Looks like two versions of mitosis
DNA does not duplicate a second time through prophase
1 cell makes two identical cells, then each of these makes two cells with ½ the normal number of chromosomes

14. NEW ORGANISM WITH RIGHT NUMBER OF CHROMOSOMES
MEIOSIS
The egg cell and sperm cell combine to form a zygote (new organism)
½ chromosomes in egg + ½ chromosome in sperm =
NEW ORGANISM WITH RIGHT NUMBER OF CHROMOSOMES

15. MEIOSIS
One cell makes 4 reproductive cells