Complete Solutions and Summary of Heredity – NCERT Class 10, Science, Chapter 8 – Summary, Questions, Answers, Extra Questions
Comprehensive summary and explanation of Chapter 8 'Heredity', covering the concept of inheritance, accumulation of variation, Mendel's laws of inheritance, dominant and recessive traits, segregation and independent assortment, genetic material, chromosomes, sex determination in humans, and practice-based as well as theoretical questions—paired with all question answers and extra questions from NCERT Class X Science.
Updated: 8 months ago

Heredity
Chapter 8: Science - Ultimate Study Guide | NCERT Class 10 Notes, Questions, Activities & Quiz 2025
Full Chapter Summary & Detailed Notes - Heredity Class 10 NCERT
Overview & Key Concepts
- Chapter Goal: Understand how variations arise and are inherited. Exam Focus: Mendel experiments, traits, sex determination. 2025 Updates: Links to genetics, evolution. Fun Fact: Variations from DNA errors drive diversity. Core Idea: Heredity ensures similar designs with variations. Real-World: Family resemblances, genetic disorders.
- Wider Scope: Evolution, biotechnology, human health.
Introduction: Variations in Reproduction
- Reproductive processes create similar but subtly different individuals.
- Variations produced in asexual; maximized in sexual.
- Sugarcane field little variation; sexual animals/human distinct variations.
- Study mechanisms for creation/inheritance of variations.
8.1 Accumulation of Variation During Reproduction
- Inheritance provides common body design + subtle changes for next generation.
- Second generation inherits from first + new differences.
- Asexual: Minor differences from DNA copying inaccuracies.
- Sexual: Greater diversity.
- Not all variations equal survival chances; environment selects (e.g., heat-resistant bacteria).
- Selection basis for evolution.
Questions from Page 129
- 1. Trait A (10%) likely later than B (60%) in asexual species.
- 2. Variations promote survival by advantages in environment.
8.2 Heredity
- Reproductive outcome: Similar design individuals.
- Heredity rules determine reliable inheritance of traits.
8.2.1 Inherited Traits
- Similarities/differences: Child human features but not exact parents; human variations great.
Activity 8.1
- Observe class earlobes (free/attached); calculate percentages.
- Correlate with parents; suggest inheritance rule.
8.2.2 Rules for the Inheritance of Traits – Mendel’s Contributions
- Rules relate to equal paternal/maternal genetic material.
- Each trait two versions in child.
- Mendel: Garden peas contrasting characters (round/wrinkled, tall/short, white/violet).
- Crossed tall/short; F1 all tall, no medium.
- F2: 3/4 tall, 1/4 short.
- Two gene copies; identical/different.
- Dominant (T tall), recessive (t short).
- TT/Tt tall; tt short.
Activity 8.2
- Confirm F2 1:2:1 TT:Tt:tt by experiment.
Independent Inheritance
- Two traits: Tall/round x short/wrinkled; F1 all tall/round.
- F2: New combinations (tall/wrinkled, short/round).
- Traits independent.
- 9:3:3:1 ratio.
8.2.3 How do these Traits get Expressed?
- DNA info for proteins; gene for one protein.
- Proteins control traits (e.g., hormone for height).
- Enzyme efficiency from gene affects hormone amount.
- Both parents contribute gene copy.
- Germ-cells one set; meiosis halves.
- Chromosomes: Independent pieces; maternal/paternal origin.
- Restores number in progeny.
- Asexual follows similar.
8.2.4 Sex Determination
- Sexes different for reasons; strategies vary.
- Environmental (reptiles temperature), change (snails).
- Humans: Genetically determined.
- 22 pairs + sex chromosomes.
- Women XX; men XY.
- Children inherit X from mother; X/Y from father determines girl/boy.
- 50% boys/girls.
Questions from Page 133
- 1. Mendel shows dominant/recessive traits.
- 2. Traits inherited independently.
- 3. Blood group O recessive; A dominant.
- 4. Sex by paternal X/Y chromosome.
What You Have Learnt (Page 133)
- Variations inherited; increase survival.
- Two gene copies; dominant expresses if present.
- Traits separate in offspring.
- Sex: Paternal X girl, Y boy.
Exercises (Page 133)
- 1. Tall parent TtWW.
- 2. Light eyes dominant? Cannot say without more data.
- 3. Project: Cross dogs, observe coat colours.
- 4. Equal male/female contribution via gametes.
Why This Guide Stands Out
Complete chapter coverage: Notes, activities, Q&A (all NCERT + extras), quiz. Student-centric, exam-ready for 2025. Free & ad-free.
Key Themes & Tips
- Variations: Accumulated, inherited.
- Mendel: Dominance, independence.
- Sex: XY system.
- Tip: Practice ratios; link to DNA.
Exam Case Studies
Mendel crosses; trait ratios; sex determination.
Project & Group Ideas
- Family traits survey; model Mendel peas; discuss genetics ethics.



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