3. Meiosis
.Division of gametes (sex cells)
4 daughter cells produced
Each daughter cell has half the chromosomes of the parent
2 sets of cell division involved

4. Why Do we Need Meiosis?
It is the fundamental basis of sexual reproduction
Two haploid (1n) gametes are brought together through fertilization to form a diploid (2n) zygote

5. (Chromosome number doubled)
Meiosis I: Reduction Division
Nucleus
Spindle
fibers
Nuclear
envelope
Early Prophase I
(Chromosome number doubled)
Late Prophase I
Metaphase I
Anaphase I
Telophase I (diploid)

7. Review Mitosis & Meiosis
Both are forms of nuclear division
Both involve replication
Both involve disappearance of the nucleus, and nucleolus, nuclear membrane
Both involve formation of spindle fibers

8. DIFFERENCES
Meiosis produces daughter cells that have 1/2 the number of chromosomes as the parent. Go from 2n to 1n.
Daughter cells produced by meiosis are not genetically identical to one another.
In meiosis cell division takes place twice but replication occurs only once.

10. The cell cycle
G1 - primary growth phase
S – synthesis; DNA replicated
G2 - secondary growth phase
collectively these 3 stages are called interphase
M - mitosis
C - cytokinesis

12. Cell Divides into Identical cells
DNA Copied
Cells prepare
for Division
Cells Mature
Daughter Cells
Cell Divides into Identical cells