| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Examples of organisms reproducing by both methods includes: ? Malarial parasites reproduce asexually in the human host, but sexually in
the mosquito.
? Many fungi reproduce asexually by spores but also reproduce sexually to give variation.
? Many plants produce seeds sexually, but also reproduce asexually by runners such as strawberry plants, or bulb division such as daffodils.
Historical developments of our understanding of the causes and prevention of malaria. (WS) |
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Knowledge of reproduction in organisms is restricted to those mentioned |
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Students are expected to be able to explain the advantages and
disadvantages of asexual and sexual reproduction for any organism if given appropriate information.
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Research task: Malarial parasite (plasmodium), fungi such mushrooms and plants - strawberry plants and daffodils.
Describe how these species reproduce both sexually and asexually. |
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Advantages of sexual reproduction:
? produces variation in the offspring
? if the environment changes variation gives a survival advantage by natural selection
? natural selection can be speeded up by humans in selective breeding to increase food production.
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What are the advantages of sexual reproduction? |
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Advantages of asexual reproduction:
? only one parent needed
? more time and energy efficient as do not need to find a mate
? faster than sexual reproduction
? many identical offspring can be produced when conditions are favourable.
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What are the advantages of asexual reproduction? Separates only - Think Pair Share - suggestions of the advantages and disadvantages of both reproductive strategies. Question about which strategies suit animals depending on how long they live/how long the offspring are cared for. |
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Some organisms reproduce by both methods depending on the
circumstances.
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Do all organisms have to reproduce only sexually or asexually? Separates only - EW Compare the use of asexual and sexual reproduction as strategies for the aphid (asexual of successful individuals in the summer when resources are plentiful, sexual for the next year to introduce variation for what may be different conditions next year)
GF: Suggest how this life cycle strategy could have evolved. |
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