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

Categories: NCERT, Class X, Science, Biology, Summary, Extra Questions, Genetics, Heredity, Mendelism, Chromosomes, Sex Determination, Chapter 8
Tags: Heredity, Genetics, Inheritance, Variation, Mendel's Laws, Dominant Trait, Recessive Trait, Chromosomes, Genes, Sex Determination, Asexual Reproduction, Sexual Reproduction, Blood Groups, Genetic Combination, NCERT, Class 10, Science, Chapter 8, Answers, Extra Questions
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Heredity Class 10 NCERT Chapter 8 - Ultimate Study Guide, Notes, Questions, Quiz 2025

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.
Practice Quiz

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कक्षा 10 संस्कृत — रचना-प्रयोगः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#7

कक्षा 10 संस्कृत — वाच्य-परिवर्तनम् (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#8

कक्षा 10 संस्कृत — कारक एवं विभक्ति (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#9

कक्षा 10 संस्कृत — समास परिचय (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#10

कक्षा 10 संस्कृत — प्रत्ययाः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#11

कक्षा 10 संस्कृत — अव्ययानि (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#12

कक्षा 10 संस्कृत — उपसर्गाः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#13

कक्षा 10 संस्कृत — धातुरूप परिचय (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#14

कक्षा 10 संस्कृत — शब्दरूप परिचय (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#15

कक्षा 10 संस्कृत — सन्धिः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#16

कक्षा 10 संस्कृत — संज्ञा एवं परिभाषा (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#17

कक्षा 10 संस्कृत — वर्णविचारः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#18

कक्षा 10 संस्कृत — भूकंपविभीषिका (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#19

कक्षा 10 संस्कृत — सूक्तयः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#20

कक्षा 10 संस्कृत — विचित्रः साक्षी (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#21

कक्षा 10 संस्कृत — सौहार्दं प्रकृतेः शोभा (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#22

कक्षा 10 संस्कृत — सुभाषितानि (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#23

कक्षा 10 संस्कृत — जननी तुल्यवत्सला (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#24

कक्षा 10 संस्कृत — शिशुलालनम् (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#25

कक्षा 10 संस्कृत — व्यायामः सर्वदा पथ्यः (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#26

कक्षा 10 संस्कृत — बुद्धिर्बलवती सदा (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#27

कक्षा 10 संस्कृत — शुचिपर्यावरणम् (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#28

कक्षा 10 हिंदी — टोपी शुक्ला (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#29

कक्षा 10 हिंदी — सपनों के-से दिन (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#30

कक्षा 10 हिंदी — हरिहर काका (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#31

कक्षा 10 हिंदी — पतझर में टूटी पत्तियाँ, कारतूस (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#32

कक्षा 10 हिंदी — अब कहाँ दूसरे के दुख से दुखी होने वाले (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#33

कक्षा 10 हिंदी — गिरगिट (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#34

कक्षा 10 हिंदी — तीसरी कसम के शिल्पकार शैलेंद्र (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#35

कक्षा 10 हिंदी — तताँरा-वामीरो कथा (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#36

कक्षा 10 हिंदी — डायरी का एक पन्ना (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#37

कक्षा 10 हिंदी — बड़े भाई साहब (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#38

कक्षा 10 हिंदी — तोप, कर चले हम फ़िदा, आत्मत्राण (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#39

कक्षा 10 हिंदी — मधुर-मधुर मेरे दीपक जल (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#40

कक्षा 10 हिंदी — पर्वत प्रदेश में पावस (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#41

कक्षा 10 हिंदी — मनुष्यता (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#42

कक्षा 10 हिंदी — बिहारी के दोहे (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#43

कक्षा 10 हिंदी — मीरा के पद (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#44

कक्षा 10 हिंदी — कबीर की साखी (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#45

कक्षा 10 हिंदी — मैं क्यों लिखता हूँ (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#46

कक्षा 10 हिंदी — साना-साना हाथ जोड़ि (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#47

कक्षा 10 हिंदी — माता का अँचल (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#48

कक्षा 10 हिंदी — संस्कृति (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#49

कक्षा 10 हिंदी — नौबतखाने में इबादत (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#50

कक्षा 10 हिंदी — एक कहानी यह भी (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#51

कक्षा 10 हिंदी — लखनवी अंदाज़ (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#52

कक्षा 10 हिंदी — बालगोबिन भगत (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#53

कक्षा 10 हिंदी — नेताजी का चश्मा (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#54

कक्षा 10 हिंदी — संगतकार (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#55

कक्षा 10 हिंदी — यह दंतुरित मुसकान, फसल (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#56

कक्षा 10 हिंदी — उत्साह, अट नहीं रही है (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#57

कक्षा 10 हिंदी — आत्मकथ्य (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#58

कक्षा 10 हिंदी — राम-लक्ष्मण-परशुराम संवाद (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
#59

कक्षा 10 हिंदी — सूरदास के पद (अभ्यास प्रश्नोत्तरी)

10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
#65

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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
#78

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10 Qs · ~10 min
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10 Qs · ~10 min
#80

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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
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10 Qs · ~10 min
#87

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10 Qs · ~10 min
#88

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10 Qs · ~10 min
#89

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10 Qs · ~10 min
#90

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10 Qs · ~10 min
#91

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10 Qs · ~10 min
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10 Qs · ~10 min
#93

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10 Qs · ~10 min
#94

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10 Qs · ~10 min
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10 Qs · ~10 min
#96

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10 Qs · ~10 min
#97

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10 Qs · ~10 min
#98

Class 10 Social Science — Globalisation and the Indian Economy (Practice Quiz)

10 Qs · ~10 min
#99

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10 Qs · ~10 min
#100

Class 10 Social Science — Sectors of the Indian Economy (Practice Quiz)

10 Qs · ~10 min
#101

Class 10 Social Science — Development (Practice Quiz)

10 Qs · ~10 min
#102

Class 10 Social Science — Outcomes of Democracy (Practice Quiz)

10 Qs · ~10 min
#103

Class 10 Social Science — Political Parties (Practice Quiz)

10 Qs · ~10 min
#104

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10 Qs · ~10 min
#105

Class 10 Social Science — Federalism (Practice Quiz)

10 Qs · ~10 min
#106

Class 10 Social Science — Power-sharing (Practice Quiz)

10 Qs · ~10 min
#107

Class 10 Social Science — Lifelines of National Economy (Practice Quiz)

10 Qs · ~10 min
#108

Class 10 Social Science — Manufacturing Industries (Practice Quiz)

10 Qs · ~10 min
#109

Class 10 Social Science — Minerals and Energy Resources (Practice Quiz)

10 Qs · ~10 min
#110

Class 10 Social Science — Agriculture (Practice Quiz)

10 Qs · ~10 min
#111

Class 10 Social Science — Water Resources (Practice Quiz)

10 Qs · ~10 min
#112

Class 10 Social Science — Forest and Wildlife Resources (Practice Quiz)

10 Qs · ~10 min
#113

Class 10 Social Science — Resources and Development (Practice Quiz)

10 Qs · ~10 min
#114

Class 10 Social Science — Print Culture and the Modern World (Practice Quiz)

10 Qs · ~10 min
#115

Class 10 Social Science — The Age of Industrialisation (Practice Quiz)

10 Qs · ~10 min
#116

Class 10 Social Science — The Making of a Global World (Practice Quiz)

10 Qs · ~10 min
#117

Class 10 Social Science — Nationalism in India (Practice Quiz)

10 Qs · ~10 min
#118

Class 10 Social Science — The Rise of Nationalism in Europe (Practice Quiz)

10 Qs · ~10 min
#119

Class 10 Science — Our Environment (Practice Quiz)

10 Qs · ~10 min
#120

Class 10 Science — Magnetic Effects of Electric Current (Practice Quiz)

10 Qs · ~10 min
#121

Class 10 Science — Electricity (Practice Quiz)

10 Qs · ~10 min
#122

Class 10 Science — The Human Eye and the Colourful World (Practice Quiz)

10 Qs · ~10 min
#123

Class 10 Science — Light – Reflection and Refraction (Practice Quiz)

10 Qs · ~10 min
#124

Class 10 Science — Heredity (Practice Quiz)

10 Qs · ~10 min
#125

Class 10 Science — How do Organisms Reproduce? (Practice Quiz)

10 Qs · ~10 min
#126

Class 10 Science — Control and Coordination (Practice Quiz)

10 Qs · ~10 min
#127

Class 10 Science — Life Processes (Practice Quiz)

10 Qs · ~10 min
#128

Class 10 Science — Carbon and its Compounds (Practice Quiz)

10 Qs · ~10 min
#129

Class 10 Science — Metals and Non-metals (Practice Quiz)

10 Qs · ~10 min
#130

Class 10 Science — Acids, Bases and Salts (Practice Quiz)

10 Qs · ~10 min
#131

Class 10 Maths — Probability (Practice Quiz)

10 Qs · ~10 min
#132

Class 10 Maths — Statistics (Practice Quiz)

10 Qs · ~10 min
#133

Class 10 Maths — Surface Areas and Volumes (Practice Quiz)

10 Qs · ~10 min
#134

Class 10 Maths — Areas Related to Circles (Practice Quiz)

10 Qs · ~10 min
#135

Class 10 Maths — Circles (Practice Quiz)

10 Qs · ~10 min
#136

Class 10 Maths — Some Applications of Trigonometry (Practice Quiz)

10 Qs · ~10 min
#137

Class 10 Maths — Introduction to Trigonometry (Practice Quiz)

10 Qs · ~10 min
#138

Class 10 Maths — Coordinate Geometry (Practice Quiz)

10 Qs · ~10 min
#139

Class 10 Maths — Triangles (Practice Quiz)

10 Qs · ~10 min
#140

Class 10 Maths — Arithmetic Progressions (Practice Quiz)

10 Qs · ~10 min
#141

Class 10 Maths — Quadratic Equations (Practice Quiz)

10 Qs · ~10 min
#142

Class 10 Maths — Pair of Linear Equations in Two Variables (Practice Quiz)

10 Qs · ~10 min
#143

Class 10 Maths — Polynomials (Practice Quiz)

10 Qs · ~10 min
#144

Class 10 Maths — Real Numbers (Practice Quiz)

10 Qs · ~10 min
#145

Class 10 Science — Chemical Reactions and Equations (Practice Quiz)

10 Qs · ~10 min
#146

Political Science: Democratic Politics II Practice Quiz | CBSE Class 10 Board Examination

10 Qs · ~10 min
#147

Economics: Understanding Economic Development Practice Quiz | CBSE Class 10 Board Examination

10 Qs · ~10 min
#148

Hindi A/B (Kshitij II / Sparsh II / Kritika II / Sanchayan II) Practice Quiz | CBSE Class 10 Board Examination

10 Qs · ~10 min
#149

Carbon and Its Compounds Advanced Challenge | CBSE Class 10 Board Examination

10 Qs · ~10 min

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