Principles of Inheritance and Variation is a Class 12 Biology chapter that carries about 4.7% of the Biology questions in NEET. Practise it with 66 questions covering 2 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Principles of Inheritance and Variation had 64 questions, about 4.9 a year. The most in one paper was 9, in NEET 2023.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 6 |
| NEET 2025 | 3 |
| NEET 2024 | 6 |
| NEET 2023 | 9 |
| NEET 2022 | 6 |
| NEET 2021 | 3 |
| NEET 2020 | 4 |
| NEET 2019 | 5 |
| NEET 2018 | 4 |
| NEET 2017 | 4 |
| NEET 2016 | 5 |
| Re-AIPMT 2015 | 6 |
| AIPMT 2014 | 3 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
The 'law of dominance' says that:
Answer: D. in a heterozygote, one allele (the dominant) expresses itself while the other (the recessive) is masked
Why: The F₁ of TT × tt are all tall.
In honeybees, the males (drones) develop from:
Answer: A. unfertilised (haploid) eggs, by parthenogenesis
Why: The sex determination is haplodiploid.
In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), the phenotypic ratio expected in the F2 generation is:
Answer: C. 9:3:3:1
Why: Mendel's law of independent assortment predicts a 9:3:3:1 ratio for two independently assorting traits in a dihybrid cross.
Turner's syndrome is caused by a chromosomal complement of:
Answer: C. 44 autosomes + XO
Why: Affected females are sterile, short, with rudimentary ovaries and a webbed neck.
In a monohybrid cross between a homozygous tall (TT) and homozygous dwarf (tt) pea plant, the F1 generation will be:
Answer: A. all tall
Why: Since tallness is dominant over dwarfness in Mendel's pea plants, all F1 offspring (Tt) will be tall, showing the dominant phenotype.
The gain of an entire set of chromosomes, which is common in plants, is called:
Answer: C. polyploidy
Why: It can result from failure of cytokinesis after chromosome replication.
Mendel's work was rediscovered in 1900 by:
Answer: A. de Vries, Correns and Tschermak
Why: They arrived at similar conclusions independently.
In genetic terms, 'coupling' of two linked genes means that:
Answer: D. the two dominant alleles lie on one chromosome and the two recessive alleles on the other
Why: In repulsion, each chromosome carries one dominant and one recessive allele.
Principles of Inheritance and Variation carries about 4.7% of the Biology questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 64 times, about 4.9 questions a year.
Principles of Inheritance and Variation is a Class 12 Biology chapter in the NCERT syllabus.
NeetVictory has 66 practice questions on Principles of Inheritance and Variation, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
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