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Watch video lecture on YouTube: 3 Mendelian Laws of Inheritance - Fundamentals of Genetics

3 Mendelian Laws of Inheritance - Fundamentals of Genetics

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Mendel’s Laws of Inheritance

  • How Mendel began his work

  • Law of Dominance

Hybrids show Dominant trait (Phenotype)

  • Law of Segregation

Each allele retain itself distinct identity even though they remain together

Mendel’s Laws of Inheritance Image-1

Mendel’S Laws of Inheritance Image-1

Mendel’s Laws of Inheritance Image-1

Mendel’s Laws of Inheritance Image-2

Mendel’S Laws of Inheritance Image-2

Mendel’s Laws of Inheritance Image-2

  • When dominant AA and recessive aa is crossed, the percentage ratio of the hybrid showing the parental genotypes is

(A) 0% (B) 25% (C) 50% (D) 75%

  • Which cross would produce phenotypic ratios that would illustrate the Law of Dominance?

  1. Equation

  2. Equation

  3. Equation

  4. Equation

How many gametes would be formed from Aa Bb Cc?

  • How many gametes would be formed from Aa Bb cc?

Law of Independent Assortment pendent Assortment

‘when two pairs of traits are combined in a hybrid, segregation of one pair

of characters is independent of the other pair of characters’

Law of Independent Assortment Image-1

Law of Independent Assortment Image-1

Law of Independent Assortment Image-1

How many different types of phenotypes would be formed from a cross of RrYy x RrYy?

Assuming complete dominance, what is the phenotypic ratio of the offspring of the cross

Equation (a) 1:1 (b) 3:1(c) 1:1:1:1(d) 9:3:3:1

  • AA, Aa-Red

  • aa-white

  • BB-,Bb-Big

  • bb-small

    Law of Independent Assortment Image-2

    Law of Independent Assortment Image-2

    Law of Independent Assortment Image-2