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NDA Genetics and Heredity questions with solutions

Inheritance and genetics. 13 questions from our 2016–2025 NDA pattern papers, from the Class 12 Biology syllabus. Each has the answer and a full solution.

NDA 2025

In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), the phenotypic ratio of the F2 generation isNDA 2025 GAT · medium
The sex of a human child is determined by the egg released by the mother. 2. A normal human male has one X and one Y chromosome.NDA 2025 GAT · medium

NDA 2024

In a cross between two heterozygous tall pea plants (Tt × Tt), where tallness is dominant, the fraction of tall offspring expected isNDA 2024 GAT · hard

NDA 2023

A woman who is a carrier of haemophilia (an X-linked recessive disorder) marries a normal man. The probability that a given son of the couple is…NDA 2023 GAT · medium

NDA 2021

The number of chromosomes in a normal human gamete (sperm or egg) isNDA 2021 GAT · hard
When pure tall pea plants (TT) are crossed with pure dwarf plants (tt), the F2 generation shows the phenotypic ratio of tall to dwarf asNDA 2021 GAT · hard

NDA 2020

NDA 2019

Gregor Mendel experimented with pea plants and studied how many pairs of contrasting characters?NDA 2019 GAT · easy

NDA 2018

In Mendel's monohybrid cross between tall (TT) and dwarf (tt) pea plants, the phenotypic ratio in the F2 generation isNDA 2018 GAT · medium

NDA 2017

The number of autosomes in a normal human body cell isNDA 2017 GAT · hard
Sex determination in humans: 1. The sex of a child is determined by the chromosome received from the father. 2. A normal human female has one X and…NDA 2017 GAT · medium

NDA 2016

Genes are located on chromosomes. 2. A human sperm cell contains 46 chromosomes.NDA 2016 GAT · medium

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Current Affairs 37 Indian Economy 36 Constitution and Fundamental Rights 46 Parliament, Executive and Judiciary 23 Ancient India 36 Medieval India 28 Freedom Struggle 50 Modern India and British Rule 41 World Geography 29 Indian Geography 81 Physical Geography 31 Units and Measurements 11 Motion, Forces and Gravitation 40 Work, Energy and Power 7 Fluids and Pressure 10 Heat and Thermal Physics 8 Sound and Waves 16 Light and Optics 37 Current Electricity 20 Magnetism and Electromagnetic Induction 17 Nuclear and Modern Physics 9 Atomic Structure, Periodic Table and Bonding 31 Acids, Bases and Salts 13 Metals, Alloys and Corrosion 20 Carbon and Organic Chemistry 22 Chemical Reactions 12 Mole Concept and States of Matter 13 Chemistry in Everyday Life 16 Cell Biology and Classification 18 Plant Physiology 21 Nutrition, Diseases and Health 28 Human Physiology 62 Ecology and Environment 24