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Principles of Inheritance and Variation — Revision Notes

Madhya Pradesh Board · Class 12 · Biology

Principles of Inheritance and Variation revision notes for Madhya Pradesh Board Class 12 Biology: 4 topics in quick points.

39 questions80 flashcards2 formulas & key relations5 concepts

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A comparison chart illustrating Mendel's seven pairs of contrasting traits in pea plants, showing both dominant and recessive phenotypes for each trait.
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Key Topics to Revise

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1. Mendel’s Work and Basic Terms

  • Genetics deals with inheritance and variation.
  • Inheritance is the process by which characters are passed on from parent to progeny; it is the basis of heredity.
  • Variation is the degree by which progeny differ from their parents.
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2. Inheritance of One Gene: Monohybrid Cross

  • Mendel crossed tall and dwarf pea plants to study inheritance of one gene.
  • In the F1 generation, all plants were tall and none were dwarf.
  • In the F2 generation, the phenotypic ratio was 3 tall : 1 dwarf.
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3. Incomplete Dominance and Co-dominance

  • Incomplete dominance occurs when the F1 phenotype is intermediate between the two parents.
  • In snapdragon, red-flowered RR crossed with white-flowered rr produces pink F1 plants of genotype Rr.
  • The F2 ratio in this case is 1 red : 2 pink : 1 white.
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4. Dihybrid Cross and Independent Assortment

  • Mendel crossed plants differing in two characters, such as seed shape and seed colour.
  • Round shape is dominant over wrinkled and yellow colour is dominant over green.
  • The F1 genotype in the standard dihybrid cross is RrYy.

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Full Notes

Key Concepts

Inheritance is the process byGregor Mendel carried out hybridisation experimentsIn a dissimilar pair of factorsThe two alleles of a geneA cross involving one character

Frequently Asked Questions

What are the important topics in Principles of Inheritance and Variation for Madhya Pradesh Board Class 12 Biology?
Key topics in Principles of Inheritance and Variation include Mendel’s Work and Basic Terms, Inheritance of One Gene: Monohybrid Cross, Incomplete Dominance and Co-dominance, Dihybrid Cross and Independent Assortment. Study these first, then practise questions on each for the Madhya Pradesh Board Class 12 board exam.
How should I revise Principles of Inheritance and Variation for the Madhya Pradesh Board Class 12 board exam?
Learn the core ideas first, then work through the 39 practice questions on Principles of Inheritance and Variation. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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