Meiosis

What is the result of Meiosis?

4 haploid daughter cells

Phases of Meiosis

1. Meiosis I

2. Meiosis II

Stages of Meiosis

1. Prophase I

2. Metaphase I

3. Anaphase I

4. Telophase I

5. Cytokinesis

6. Metaphase II

7. Anaphase II

8. Telophase II

9. Cytokinesis

Stage 1 of Meiosis: Prophase I

• nuclear envelop begins to disappear

• fibers begin to form

• DNA coils into visible duplicated chromosomes made up of sister chromatids

• double chromosomes pair up based on size, shape, centromere location, & genetic info.

• chromatids exchange genetic info. with chromatids from other chromosomes while they are paired

Stage 2 of Meiosis: Metaphase I

• double chromosomes remain in pairs

• fibers align pairs across center of cell

Stage 3 of Meiosis: Anaphase I

• fibers separate chromosome pairs

• each double chromosome, from the pair, migrates to opposite sides of cell

Stage 4 of Meiosis: Telophase I

• nuclear envelope reappears & establishes 2 separate nuclei

• each nucleus contains only one double chromosome from each pair

Stage 5 of Meiosis: Cytokinesis

separates the cell into two daughter cells; daughter cells are haploid & genetically different from each other and parent cell

Stage 6 of Meiosis: Metaphase II

• fibers align double chromosomes across center of cell

Stage 7 of Meiosis: Anaphase II

• fibers separate sister chromatids

• chromatids migrate to opposite sides of cell

Stage 8 of Meiosis: Telophase II

• nuclear envelope reappears & establishes separate nuclei

• each nucleus contains single chromosomes

• chromosomes begin to uncoil

Stage 9 of Meiosis: Cytokinesis

separate 2 cells into 4 daughter cells; daughter cells are haploid & genetically different from each other & parent cell

Meiosis & Mitosis Similarities(what they both involve)

1. nuclear envelop disappearing

2. DNA coiling into chromosomes

3. aligning chromosomes in center of cell

4. using fibers to separate chromosomes

5. nuclear envelope reappearing

6. chromosomes uncoiling

7. followed by cytokinesis and production of daughter cells

Meiosis & Mitosis Differences

1. mitosis produces 2 daughter cells that are genetically identical to the parent cell

2. meiosis produces 4 haploid daughter cells that are genetically varied from each other and the parent cell