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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:

  • Sex-Linked Inheritance
  • Inheritance of Color Blindness – Carrier Mother and Father with Color Blindness
  • Inheritance of Haemophilia – Carrier Mother and Father without Haemophilia

Characters carried on the X chromosome are said to be sex-linked.

Common examples of sex-linked traits are;

  • Colour blindness.
  • Red-green colour blindness.
  • Haemophilia.
  • Male pattern baldness.
  • Adrenoleukodystrophy (ALD).

A person with red-green colour blindness cannot see red, instead, red and green objects appear green. A typical test for red-green colour blindness is a number made out of dots. If you can see the number then you have normal vision, with red-green colour blindness, the number is invisible.

color blindness
With properly configured computer displays, people with normal vision should see the number “12”. Viewers with red-green colour blindness may not see any numbers.

 

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