Meiosis

1
Meiosis

• Concept 9.5

2
Chromosomes

• In Meiosis, chromosomes with similar size, shape,
  and trait pair up.
• Homologous chromosomes

3
Diploid vs Haploid

• Abbreviated by 2n
• Full compliment of chromosomes
• Found in body cells
• Human 2n 46

• Abbreviated by n
• ½ the number of chromosomes
• Found in sex cells
• Human n 23

4
Meiosis

• Process of dividing a diploid cell into 4 haploid
  cells.
• Happens in sperm and egg cells

5
Stages of Meiosis

• Prophase I
• Metaphase I
• Anaphase I
• Telophase I
• Cytokinesis

• Prophase II
• Metaphase II
• Anaphase II
• Telophase II
• Cytokinesis

6
Events of Meiosis

• Crossing Over
• Independent Assortment

7
Crossing Over

• Tetrads form and exchange genetic information
• Occurs during Prophase I

8
Importance of Crossing Over

• Increases the chance of different genetic
  combinations
• Increases the chance of having different genetics
  from siblings, parents, etc.

9
Independent Assortment

• Random separation of tetrads
• Occurs during Anaphase I

10
End Result of Meiosis

• 4 haploid cells are created from 1 diploid cell