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SS3: BIOLOGY - 2ND TERM

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  1. Reproductive Behaviours | Week 1
    1 Topic
    |
    1 Quiz
  2. Life Cycles of Insects, Toads | Week 2
    6 Topics
    |
    1 Quiz
  3. Social Insects | Week 3
    2 Topics
    |
    1 Quiz
  4. Biology of Heredity (Genetics) I | Week 4
    4 Topics
  5. Biology of Heredity (Genetics) II | Week 5
    6 Topics
    |
    1 Quiz
  6. Biology of Heredity (Genetics) III | Week 6
    7 Topics
    |
    1 Quiz
  7. Variation | Week 7
    1 Topic
    |
    1 Quiz
  8. Evolution | Week 8
    3 Topics
    |
    1 Quiz



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Topic Content:

  • Common Terms in Genetics

Defined below are some common/important terms used in Genetics;

1. Genes: These are heredity units or basic units of inheritance. It is a short section of DNA. DNA, which is short for Deoxyribonucleic acid, is a molecule which carries the genetic instructions or the hereditary materials. Genes are located in the chromosome and are responsible for the transmission of characters from parents to offspring.

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2. Chromosomes: These are thread-like bodies found in the nucleus of a cell. They contain genes.

3. Character or Traits: These are inheritable features or characteristics possessed by an organism e.g seed colour, the shape of a fruit. A trait is a unique variation of an organism’s character for example yellow seed colour or purple flower colour.

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Dominant and Recessive Plant Traits.

4. Locus: This refers to a specific, fixed position on a chromosome where a particular gene or genetic marker is located.

 

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