Chapter Exam

Unit 3 Chapter 9: Principles of Inheritance and Variation — Online MCQ Test

Q: Which scientist is known as the 'Father of Genetics'?

Answer: B. Gregor Johann Mendel — Gregor Johann Mendel laid the foundation of genetics through his experiments on pea plants.

Q: In a monohybrid cross, the F2 phenotypic ratio is usually:

Answer: B. 3:1 — A monohybrid cross involving complete dominance gives a 3:1 phenotypic ratio in the F2 generation.

Q: In Mendel's dihybrid cross, the phenotypic ratio in F2 is:

Answer: C. 9:3:3:1 — A dihybrid cross with independent assortment gives the classic 9:3:3:1 phenotypic ratio.

Q: In a test cross, a tall pea plant is crossed with a dwarf plant. If all the offspring are tall, the genotype of the tall parent is most likely:

Answer: C. TT — If all offspring are tall in a test cross with dwarf (tt), the tall parent must be homozygous dominant (TT).

BOTANY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 3 Chapter 9: Principles of Inheritance and Variation with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY. This chapter covers: Focusing on classical genetics this chapter details Mendelian inheritance principles monohybrid dihybrid crosses incomplete dominance codominance multiple alleles polygenic inherit.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 3 Chapter 9: Principles of Inheritance and Variation — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY — Unit 3 Chapter 9: Principles of Inheritance and Variation, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which scientist is known as the 'Father of Genetics'?

A. Charles Darwin
B. Gregor Johann Mendel ✓
C. Thomas Hunt Morgan
D. Watson and Crick

Answer: B. Gregor Johann Mendel
Gregor Johann Mendel laid the foundation of genetics through his experiments on pea plants.

In a monohybrid cross, the F2 phenotypic ratio is usually:

A. 1:2:1
B. 3:1 ✓
C. 9:3:3:1
D. 2:1

Answer: B. 3:1
A monohybrid cross involving complete dominance gives a 3:1 phenotypic ratio in the F2 generation.

In Mendel's dihybrid cross, the phenotypic ratio in F2 is:

A. 3:1
B. 1:2:1
C. 9:3:3:1 ✓
D. 2:1:1

Answer: C. 9:3:3:1
A dihybrid cross with independent assortment gives the classic 9:3:3:1 phenotypic ratio.

In a test cross, a tall pea plant is crossed with a dwarf plant. If all the offspring are tall, the genotype of the tall parent is most likely:

A. tt
B. Tt
C. TT ✓
D. Either Tt or TT

Answer: C. TT
If all offspring are tall in a test cross with dwarf (tt), the tall parent must be homozygous dominant (TT).

Which of the following is the most appropriate statement about multiple alleles?

A. More than two alleles of a gene can exist in a population, though an individual has only two ✓
B. A single individual always carries more than two alleles for a gene
C. Multiple alleles mean multiple genes control the same trait
D. Multiple alleles are found only in sex-linked traits

Answer: A. More than two alleles of a gene can exist in a population, though an individual has only two
Multiple alleles occur in a population as more than two alternate forms of a gene, but each diploid individual carries only two alleles.

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Unit 4 Chapter 10: Molecular Basis of Inheritance