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Important Questions

Genetics

ICSE · Class 10 · Biology

Most important questions from Genetics for ICSE Class 10 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.

45 questions25 flashcards5 concepts

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A flowchart demonstrating a monohybrid cross between true-breeding tall and dwarf pea plants, showing P, F1, and F2 generations with genotypes, phenotypes, and ratios.
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45 Questions·
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Sample Questions

1multiple correct

Which of the following are reasons why Mendel selected garden pea for his experiments?

Show answer

Annual plant with short life span, Seven pairs of contrasting characters, Self-pollinated and can be cross-pollinated, High yield

Mendel selected garden pea because it is an annual plant (short life span), has seven pairs of easily detectable contrasting characters, is self-pollinated but can be cross-pollinated, and has high yield. Being expensive was not a reason for selection.

2multiple correct

Which nitrogenous bases are purines in DNA?

Show answer

Adenine, Guanine

Purines are double-ringed compounds in DNA. Adenine and Guanine are purines. Cytosine and Thymine are pyrimidines (single-ringed compounds).

3multiple choice

In humans, which parent determines the sex of the child?

Show answer

Father

In humans, the father determines the sex of the child because males produce two types of sperms (22+X and 22+Y), while females produce only one type of ovum (22+X). The type of sperm that fertilizes the ovum determines the child's sex.

4multiple choice

What is the phenotypic ratio in F2 generation of a monohybrid cross?

Show answer

3:1

In a monohybrid cross, the phenotypic ratio in F2 generation is 3:1 (dominant:recessive). The genotypic ratio is 1:2:1. The 9:3:3:1 ratio is for dihybrid cross.

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Frequently Asked Questions

What are the important topics in Genetics for ICSE Class 10 Biology?
Key topics in Genetics include Sex Determination in Humans — Correct vs Incorrect Understanding, DNA Base Pairing — The Correct Rule vs Common Error, Genetics Key Concepts — What They Really Mean. These are the concepts ICSE Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Genetics — ICSE Class 10 Biology?
Understand the core concepts first, then work through the 45 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 Genetics?
There are 45 practice questions available for Genetics. 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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