Meiosis

1
Meiosis

• The power of reduction

2
Task

• Groups of 2.
• Time 30 to 40 minutes.
• Examine the meiosis diagram on pages 48 and 49.
  Compare this diagram to the mitose diagram on
  pages 18 and 19.

3
Task

• You have to answer the ANALYSE questions.
• Attention By the end of this activity, I pick a
  group to present the answers.

4
WEB links

• Meiosis animation
• http//www.johnkyrk.com/meiosis.html
• http//www.lewport.wnyric.org/jwanamaker/animatio
  ns/meiosis.html
• Homework for the next class Problems 4 to 6 on
  page 50.

5
Notes

• The formation of gametes by meiosis occurs in
  reproductive organs called gonads.
• Male gonades are called testes
• where sperm are formed.

6
A testicule

• Testicule

7
Notes

• Femelle gonads are the ovaries where the eggs are
  formed.

8
Vegetable ovary

• Ovary

9
Note

• Meiosis occurs continuously in the testes of
  human males once their gonads are sexually
  mature (from 12 years till the end of their life)
  to produce sperm.

10
Note

• In females, meiosis begins
• In the ovaries before birth,
• then stops, and restarts
• around 12 to 15 yearsold,
• and stops at the menopause.

11
Attention

• Key words
• Gonad reproductive organ
• Testicule and sperm
• Ovary and egg
• Gamete sperm or egg

12
Reproduction