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Principles of Inheritance and Variation

CBSE · Class 12 · Biology

Step-by-step guide to study Principles of Inheritance and Variation in CBSE Class 12 Biology. Topics to cover, practice strategy, and time allocation.

39 questions80 flashcards5 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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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 39 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Principles of Inheritance and Variation after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • Mendel used garden pea as the experimental material.
  • He selected 14 true-breeding varieties in contrasting pairs.
  • His work was published in 1865 and rediscovered in 1900.

  • F1 of the monohybrid cross was all tall.
  • F2 showed 3:1 tall to dwarf ratio.
  • Genotypic ratio in F2 is 1:2:1.

  • Incomplete dominance produces an intermediate F1 phenotype.
  • Snapdragon shows red, pink and white phenotypes.
  • Co-dominance means both parental traits appear in F1.

Common Mistakes to Avoid

Dominant always means more common, stronger, or better.

The F1 generation contains a blend of parental traits.

Genotypic ratio and phenotypic ratio in a monohybrid cross are the same.

Memory Tips

Inheritance and variation

Gregor Mendel and pea experiments

14 true-breeding pea varieties

Law of dominance

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Frequently Asked Questions

What are the important topics in Principles of Inheritance and Variation for CBSE Class 12 Biology?
Principles of Inheritance and Variation covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Principles of Inheritance and Variation — CBSE Class 12 Biology?
Understand the core concepts first, then work through the 39 practice questions available for this chapter. Revise formulas and 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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