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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 the impact of selective breeding of food plants and domesticated animals. |
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What are the impacts of selective breeding of food plants and domesticated animals? |
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Selective breeding (artificial selection) is the process by which humans breed plants and animals for particular genetic characteristics. Humans have been doing this for thousands of years since they first bred food crops from wild plants and domesticated animals. |
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What is selective breeding and how long have humans been doing it? Images of different dogs. Students ‘breed’ and name a new dog from selecting any 2 – draw a picture of their new breed. |
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Selective breeding involves choosing parents with the desired characteristic from a mixed population. They are bred together. From the offspring those with the desired characteristic are bred together. This continues over many generations until all the offspring show the desired characteristic. |
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How do humans carry out selective breeding? Draw a flow diagram to explain the steps involved in selective breeding. |
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The characteristic can be chosen for usefulness or appearance:
? Disease resistance in food crops.
? Animals which produce more meat or milk.
? Domestic dogs with a gentle nature.
? Large or unusual flowers.
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Why are certain characteristics chosen during selective breeding? What are some examples of these in plants and animals? Give examples of characteristics that are selectively bred in plants and animals and say why they are there - Table? |
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Selective breeding can lead to ?inbreeding? where some breeds are particularly prone to disease or inherited defects. |
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What disadvantages can selective breeding have? Discuss the advantages and risks of selective breeding in plants and animals.
Consider the social, economic and ethical implications of selective breeding.
Debate: should people be allowed to breed dogs? |
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Evidence for Darwin's theory is now available as it has been shown
that characteristics are passed on to offspring in genes. There is further evidence in the fossil record and the knowledge of how resistance to antibiotics evolves in bacteria. |
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What evidence is there to support Darwin's theory of evolution? |
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