Chapter Exam

Chapter 18: Heredity — Online MCQ Test

Q: Who is known as the 'Father of Genetics'?

Answer: B. Gregor Johann Mendel — Gregor Johann Mendel is called the Father of Genetics for his pioneering work on pea plants.

Q: What is the phenotypic ratio of Mendel's monohybrid cross in the F2 generation?

Answer: B. 3:1 — In a monohybrid cross, the F2 phenotypic ratio is 3 dominant to 1 recessive.

Q: A segment of DNA that codes for a specific protein is called a:

Answer: C. Gene — A gene is the functional unit of heredity and consists of a specific DNA sequence coding for a protein.

Q: What is the significance of the 9:3:3:1 ratio in a dihybrid cross?

Answer: B. It proves the law of independent assortment — The 9:3:3:1 ratio in the F2 generation shows that two different traits are inherited independently of each other.

Q: Why did Mendel select the pea plant for his experiments?

Answer: B. It showed clearly defined contrasting traits — Mendel chose pea plants because they were easy to grow, had a short life cycle, and possessed distinct contrasting traits.

SCIENCE · CLASS 10th · Tamil Nadu State Board

Practice Chapter 18: Heredity with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 10th SCIENCE. This chapter covers: Exploring genetics this chapter covers Mendel monohybrid dihybrid experiments chromosome structure DNA double helix model and sex determination. Students study genetic variations m.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 18: Heredity — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 10th SCIENCE — Chapter 18: Heredity, with answers and explanations. These are sample questions; the exam has its own separate question set.

Who is known as the 'Father of Genetics'?

A. Charles Darwin
B. Gregor Johann Mendel ✓
C. Hugo de Vries
D. James Watson

Answer: B. Gregor Johann Mendel
Gregor Johann Mendel is called the Father of Genetics for his pioneering work on pea plants.

What is the phenotypic ratio of Mendel's monohybrid cross in the F2 generation?

A. 1:2:1
B. 3:1 ✓
C. 9:3:3:1
D. 1:1

Answer: B. 3:1
In a monohybrid cross, the F2 phenotypic ratio is 3 dominant to 1 recessive.

A segment of DNA that codes for a specific protein is called a:

A. Chromosome
B. Nucleotide
C. Gene ✓
D. Chromatin

Answer: C. Gene
A gene is the functional unit of heredity and consists of a specific DNA sequence coding for a protein.

What is the significance of the 9:3:3:1 ratio in a dihybrid cross?

A. It indicates linked genes
B. It proves the law of independent assortment ✓
C. It shows co-dominance
D. It represents mutation rates

Answer: B. It proves the law of independent assortment
The 9:3:3:1 ratio in the F2 generation shows that two different traits are inherited independently of each other.

Why did Mendel select the pea plant for his experiments?

A. It had a very long lifespan
B. It showed clearly defined contrasting traits ✓
C. It could not self-pollinate
D. It produced very few seeds

Answer: B. It showed clearly defined contrasting traits
Mendel chose pea plants because they were easy to grow, had a short life cycle, and possessed distinct contrasting traits.

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