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Principles of Inheritance and Variation — Important Questions

ICSE · Class 12 · Biology

130 important questions from Principles of Inheritance and Variation for ICSE Class 12 Biology, with answers. Written for the board exams 2027.

130 questions50 flashcards5 formulas & key relations5 concepts

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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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130 Questions·
mcqmultiple choicemultiple correct

Important Questions from Principles of Inheritance and Variation

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 Heredity, Variation, and Mendel’s Work, Mendel’s Laws and Basic Crosses, Deviations from Mendelism: Incomplete Dominance, Co-dominance, Pleiotropy, and Multiple Alleles, Chromosomal Theory, Linkage, and Crossing Over. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many important questions are there in Principles of Inheritance and Variation?
Super Tutor has 130 practice questions for Principles of Inheritance and Variation, including mcq, multiple choice, multiple correct questions. A sample with answers is on this page.

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