| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Students should be able to explain how meiosis halves the number of
chromosomes in gametes and fertilisation restores the full number of chromosomes. |
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What happens to the number of chromosomes in gametes from meiosis? How is the full number of chromosomes restored? |
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Cells in reproductive organs divide by meiosis to form gametes. |
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How are gametes formed? |
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When a cell divides to form gametes:
? copies of the genetic information are made
? the cell divides twice to form four gametes, each with a single set of
chromosomes
? all gametes are genetically different from each other. |
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What happens when a cell divides to form gametes? Are the gametes genetically identical or different? |
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Gametes join at fertilisation to restore the normal number of
chromosomes. The new cell divides by mitosis. The number of cells
increases. As the embryo develops cells differentiate.
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What happens during fertilisation? What happens to the cells as the embryo grows? Pipe cleaner chromosomes (possibly take photo of each stage as they divide) and follow from duplicating the pipe cleaner chromosomes and following the path of division to end of with 4 haploid cells.
Double Bubble mitosis division with meiosis division (similar - replicate and line up along middle, differences - how they line up along the middle and the number of divisions).
GF: Explain how meiosis creates variation in the way it divides and why this is important. |
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Knowledge of the stages of meiosis is not required |
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