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SS3: AGRICULTURAL SCIENCE - 1ST TERM

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  1. Crop Improvement | Week 1
    9 Topics
    |
    1 Quiz
  2. Animal Improvement | Week 2
    6 Topics
    |
    1 Quiz
  3. Animal Health Management I - Introduction | Week 3
    7 Topics
    |
    1 Quiz
  4. Animal Health Management II | Week 4
    5 Topics
    |
    1 Quiz
  5. Animal Health Management III | Week 5
    7 Topics
    |
    1 Quiz
  6. Aquaculture | Week 6
    11 Topics
    |
    1 Quiz
  7. Apiculture or Bee-keeping | Week 7
    10 Topics
    |
    1 Quiz



Lesson 1, Topic 4
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Mendel’s First Law (Law of Segregation of Genes | Monohybrid Cross)

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Topic Content:

  • Mendel’s First Law (Law of Segregation of Genes)
  • Describe a monohybrid cross as explained by Mendel’s Law of segregation

What is Mendel’s First Law?

Mendel’s First Law – the Law of Segregation – states that from one parent, only one allelic form of a gene is passed through a gamete to the offspring. The genes are independently transmitted from one generation to another without being altered.

The law of segregation can be demonstrated in a monohybrid cross, where a cross is made between purebred homozygous plants, e.g. one tall (TT) and one short (tt).

law of segregation 1
Fig. 1.4.1 Monohybrid cross – First generation.
  • The genotype of all the F1 generation plants is Tt.
  • From the figure, all the offspring in the F1 generation are all tall (the dominant trait is T – tall, Hence, the phenotype is all tall plants but they are heterozygous, i.e. not pure breeds.)

 

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