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Important Questions

Principles of Inheritance and Variation

ICSE · Class 12 · Biology

Most important questions from Principles of Inheritance and Variation for ICSE Class 12 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.

60 questions36 flashcards

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A detailed diagram illustrating the process of crossing over, where genetic material is exchanged between non-sister chromatids of homologous chromosomes during Pachytene of Prophase I.
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60 Questions·
mcq

Sample Questions

1mcq

The plant used by Mendel for his genetic experiments was:

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Pisum sativum

Mendel used Pisum sativum (garden pea) for his genetics experiments, studying 7 pairs of contrasting traits over 8 years.

2mcq

In a monohybrid cross, the F2 phenotypic ratio is:

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3:1

In a monohybrid cross, the F2 generation shows a 3:1 phenotypic ratio (3 dominant : 1 recessive). The genotypic ratio is 1:2:1.

3mcq

The F2 phenotypic ratio in a dihybrid cross is:

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9:3:3:1

In a dihybrid cross (two independent traits), the F2 phenotypic ratio is 9:3:3:1, demonstrating Mendel's Law of Independent Assortment.

4mcq

Mendel's Law of Segregation states that:

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The two alleles of a gene separate during gamete formation

The Law of Segregation (Purity of Gametes) states that the two alleles of a gene separate during meiosis, so each gamete carries only one allele.

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Frequently Asked Questions

What are the important topics in Principles of Inheritance and Variation for ICSE Class 12 Biology?
Key topics in Principles of Inheritance and Variation include Mendel's Laws — Cross Results, ABO Blood Group Inheritance, Dihybrid Cross — F2 Ratio. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Principles of Inheritance and Variation — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 60 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Principles of Inheritance and Variation?
There are 60 practice questions available for Principles of Inheritance and Variation. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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