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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?

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

(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

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