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JSS3: BASIC SCIENCE - 1ST TERM

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  1. Family Traits | Week 1
    7 Topics
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    1 Quiz
  2. Environmental Hazards I - Soil Erosion | Week 2
    3 Topics
  3. Environmental Hazards I - Flooding | Week 3
    5 Topics
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    1 Quiz
  4. Environmental Hazards II - Bush Burning | Week 4
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  5. Environmental Hazards II - Deforestation | Week 5
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  6. Environmental Hazards III - Desertification | Week 6
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  7. Environmental Hazards III - Description of the Ozone Layer and its Location in the Atmosphere | Week 7
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  8. Drug and Substance Abuse | Week 8
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  9. Resources from Living Things | Week 9
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  10. Resources from Non-Living Things | Week 10
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Topic Content:

  • Dominant Traits
  • Recessive Traits

To understand basic terms in genetics, refer to our previous topic.

What are Dominant and Recessive Traits?

A trait is said to be dominant when it keeps appearing in each generation, while a trait is said to be recessive when they are present in an individual, yet they do not appear physically.

Dominant Traits:

If a dominant tall man, TT, marries a tall woman, who has a recessive trait for shortness, Tt, and they produce four children, all of them will be tall, meaning that the gene for tallness is dominant over the gene for shortness. 

This is demonstrated below:

Basic Science Jss3 - Traits

∴ they are all tall.

Genotypic Ratio   =  2 : 2

i.e. 2 (TT) : 2 (Tt)

 

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