1. MEIOSIS NOTES

2. Meiosis
A copying process that produces cells with half the usual number of chromosomes as the parent cell.
Creates sex cells (sperm & egg)

3. There are 2 divisions of the nucleus (called meiosis I and meiosis II)

4. Starts with 1 diploid cell and ends with 4 haploid cells.
Diploid: cell that contains pairs of homologous chromosomes.
Ex: body cells (46 chromosomes)
Haploid: cell with half the number of chromosomes as the parent (diploid) cell
Ex: sperm & egg (23 chromosomes)
diploid
diploid 46 46 46
haploid
haploid

5. **Draw & Label this example Sex Cells (sperm or eggs)
Meiosis in Humans
**Draw & Label this example 46
(92 when copied)
# of chromosomes
1st Division of Nucleus 46 46
2nd Division of Nucleus 23 23 23 23
Sex Cells (sperm or eggs)

6. **Draw & Label this example
Fertilization
The joining together of egg & sperm.
New cell formed called a zygote.
**Draw & Label this example 23 23
sperm
egg 46
zygote

7. Meiosis vs. Mitosis in Humans
Creates sperm or egg cells
Creates body cells
2 divisions of nucleus
1 division of nucleus
Ends with 4 cells
Ends with 2 cells
Cells have 23 chromosomes
Cells have 46 chromosomes
Cells are haploid
Cells are diploid
Sexual Reproduction
Asexual Reproduction