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Syllabus

Heredity — Syllabus

CBSE · Class 10 · Science

What Heredity covers in CBSE Class 10 Science: 4 topics, for the 2026-27 session. Part of the CBSE Class 10 Science syllabus.

59 questions70 flashcards5 concepts

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A flowchart illustrating how variations accumulate over successive generations, starting from an original organism and showing subtle differences in offspring through asexual reproduction, leading to
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4 Topics · CBSE Class 10 Science · 2026-27

Topics in Heredity

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1. Variation and Heredity

  • New individuals produced by reproduction are similar but subtly different because variation is present.
  • Asexual reproduction produces individuals with only minor differences due to small DNA copying inaccuracies.
  • Sexual reproduction maximises the number of successful variations compared to asexual reproduction.
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2. Mendel’s Experiments and Basic Inheritance

  • Gregor Johann Mendel studied inheritance in garden pea plants.
  • He used contrasting visible characters such as round and wrinkled seeds, tall and short plants, and white and violet flowers.
  • Mendel was the first to keep count of individuals showing a particular trait in each generation.
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3. Dihybrid Cross and Independent Inheritance

  • Mendel also studied two traits together, such as tall and short plants and round and wrinkled seeds.
  • Tallness and round seeds are dominant traits.
  • The F1 progeny of a tall round plant and a short wrinkled plant were all tall and had round seeds.
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4. How Traits Are Expressed

  • DNA contains information for making proteins in the cell.
  • A gene is a section of DNA that provides information for one protein.
  • Plant height depends on the amount of a plant hormone.

Key Concepts

Central concept: Heredity and Inheritance of Traits

Variation in reproductionMendel's experimentsSingle-trait inheritanceDominant and recessive traitsTwo-factor inheritanceGene and DNAChromosomes and gene setsFormation of offspring

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Frequently Asked Questions

What are the important topics in Heredity for CBSE Class 10 Science?
Key topics in Heredity include Variation and Heredity, Mendel’s Experiments and Basic Inheritance, Dihybrid Cross and Independent Inheritance, How Traits Are Expressed. Study these first, then practise questions on each for the CBSE Class 10 board exam.
How should I revise Heredity for the CBSE Class 10 board exam?
Learn the core ideas first, then work through the 59 practice questions on Heredity. 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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All CBSE Class 10 Science Syllabus

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