1. Answer the following question in a complete sentence.
A carrot cell contains 18 chromosomes. Which of the diagrams at the right illustrates the correct number of chromosomes in new cells produced by mitosis? How do you know?

2. Meiosis Objectives: To describe the process of meiosis
To compare meiosis to mitosis

3. Mitosis Review The process of cell division
Occurs in somatic cells which are all the cells in your body except egg and sperm cells
2N Diploid  meaning that it has two of each chromosome
These two chromosomes are identical in mitosis

4. I. Meiosis Process of making sex cells called gametes
Male gametes are sperm
Female gametes are eggs
Sex cells have half the number of chromosomes as other cells
N (haploid)
When sperm fertilizes egg  zygote
2N (diploid) – it has 2 of each chromosome, 1 from mom, 1 from dad

5. II. Meiosis occurs in 2 divisions
Interphase I - Before meiosis, cells in testes/ovaries copy DNA
Meiosis I
Prophase I - Chromosomes with same type of genetic information (homologous chromosomes) match up
these chromosomes may “swap” genes in a process called crossing over
Metaphase I - Homologous pairs line up in middle of cell RANDOMLY
Anaphase I - Pairs split up
Telophase I – Cell membrane begins to pinch in and results in 2 daughter cells are different from each other & parent cell

7. Between meiosis I and meiosis II, DNA does not copy again
Meiosis II is like mitosis
Prophase II
Metaphase II - Chromosomes line up in center of cell
Anaphase II - Chromosomes split apart & move into daughter cells
Telophase II - Nucleus forms around each set of chromosomes
End result: 4 daughter cells that are each unique

8. View meiosis

9. III. How does meiosis compare to mitosis?

10. Mitosis
Replicate once, divide once
2 daughter cells are identical to parent cell
Meiosis
Replicate once, divide twice
4 haploid daughter cells, not identical to parent or each other