1. L.O: To understand meiosis and how the sex cells determine gender
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Meiosis
L.O: To understand meiosis and how the sex cells determine gender

2. Can you identify what this picture is showing?
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3. 24/04/2017
Meiosis – another type of cell division!

4. What is meiosis? Meiosis begins with a single cell. original cell
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Meiosis begins with a single cell.
(23 chromosome pairs)
original cell
First the cell makes a copy
of each chromosome.
(92 chromosomes in total)
During the first division the pairs a split up.
(l46 chromosomes in each)
first
division
second
division
Now the chromosome copies split from the original.
The new cells contain half the genetic information and unpaired chromosomes
(23 chromosomes in each)
4 new cells

5. Meiosis animation
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6. 24/04/2017
Look at the meiosis microscope slide. Draw and explain what you can see. Why can’t we look at a normal body cell to see meiosis

7. What type of cells are formed by meiosis?
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In animals, meiosis produces ova in females and sperm cells in males.
In plants, the gametes produced by meiosis are pollen grains and ovules.

8. Sexual Reproduction
The human egg and sperm cell (“GAMETES”) contain 23 chromosomes each and are created by meiosis.
When fertilisation happens the gametes fuse together to make a single cell called a ZYGOTE. The zygote has 46 chromosomes (23 pairs) and continues to grow through mitosis.

9. Meiosis activity
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10. What are the main differences between mitosis and meiosis

11. Mitosis vs. Meiosis Mitosis: Meiosis:
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Mitosis:
Used for growth and repair of cells
Used in asexual reproduction
Cells with identical number of chromosomes and genetic information are produced
Meiosis:
Used to produce gametes for sexual reproduction
Each daughter cell has half the number of chromosomes of the parent

12. Tick or cross to indicate whether the feature applies to meiosis, mitosis or both
Occurs in growth and repair
Movement of chromosomes occurs
Daughter cells are identical to the parent cell
Chromosome number is halved
Produces haploid cells from diploid cells
Daughter cells can be different from each other

13. 24/04/2017
Worksheets

14. How do chromosomes in gametes determine sex?
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15. What does this picture show?

16. What does this picture show?

17. Boy or Girl? X X Y
“Allele” XX XY
Girl
Boy

18. Stages of mitosis activity
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Teacher Notes
The correct order of the stages of mitosis is:
1. D, 2. F, 3. A, 4. G,
5. E, 6. C, 7. B, 8. H.

19. Stages of meiosis activity
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Teacher Notes
The correct order of the stages of meiosis is:
1. E, 2. D, 3. G, 4. F,
5. A, 6. C, 7. H, 8. B.

20. 24/04/2017
Mitosis or meiosis?

21. Who wants to have a million cells?
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FLASH 2 – Mitosis drag & drop