Chapter Exam

Chapter 6: Basic Principles of Inheritance — Online MCQ Test

Q: What is the term for alternative forms of the same gene?

Answer: A. Alleles — Alleles are different forms of a gene that occupy the same locus on homologous chromosomes.

Q: In Mendel's pea plant experiments, the trait that appears in the F1 generation is called:

Answer: B. Dominant trait — The dominant trait is expressed in the F1 generation when two contrasting traits are crossed.

Q: A tall pea plant with genotype Tt is crossed with a dwarf pea plant (tt). What is the expected phenotypic ratio of the offspring?

Answer: C. 1 tall : 1 dwarf — Tt produces gametes T and t, while tt produces only t. The offspring are expected to be Tt and tt in equal numbers.

Q: Crossing over occurs during which stage of meiosis?

Answer: A. Prophase I — Crossing over occurs in Prophase I, where homologous chromosomes exchange segments and create genetic variation.

Q: In a monohybrid cross between two heterozygous individuals, what is the expected genotypic ratio in F2?

Answer: B. 1:2:1 — A monohybrid cross between heterozygotes (Aa × Aa) produces genotypes AA, Aa, and aa in the ratio 1:2:1.

BIOTECHNOLOGY · Grade 11 · CBSE(NCERT)

Practice Chapter 6: Basic Principles of Inheritance with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 BIOTECHNOLOGY. This chapter covers: Mendelian genetics inheritance dominant recessive genes alleles linkage crossing over genotype phenotype heredity genetic variation. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Basic Principles of Inheritance — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 BIOTECHNOLOGY — Chapter 6: Basic Principles of Inheritance, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the term for alternative forms of the same gene?

A. Alleles ✓
B. Chromosomes
C. Traits
D. Gametes

Answer: A. Alleles
Alleles are different forms of a gene that occupy the same locus on homologous chromosomes.

In Mendel's pea plant experiments, the trait that appears in the F1 generation is called:

A. Recessive trait
B. Dominant trait ✓
C. Mutant trait
D. Linked trait

Answer: B. Dominant trait
The dominant trait is expressed in the F1 generation when two contrasting traits are crossed.

A tall pea plant with genotype Tt is crossed with a dwarf pea plant (tt). What is the expected phenotypic ratio of the offspring?

A. All tall
B. All dwarf
C. 1 tall : 1 dwarf ✓
D. 3 tall : 1 dwarf

Answer: C. 1 tall : 1 dwarf
Tt produces gametes T and t, while tt produces only t. The offspring are expected to be Tt and tt in equal numbers.

Crossing over occurs during which stage of meiosis?

A. Prophase I ✓
B. Metaphase II
C. Anaphase II
D. Telophase I

Answer: A. Prophase I
Crossing over occurs in Prophase I, where homologous chromosomes exchange segments and create genetic variation.

In a monohybrid cross between two heterozygous individuals, what is the expected genotypic ratio in F2?

A. 3:1
B. 1:2:1 ✓
C. 9:3:3:1
D. 2:1

Answer: B. 1:2:1
A monohybrid cross between heterozygotes (Aa × Aa) produces genotypes AA, Aa, and aa in the ratio 1:2:1.

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