Chapter 6: Basic Principles of Inheritance — Online MCQ Test
BIOTECHNOLOGY · Grade 11 · CBSE(NCERT)
Practice Chapter 6: Basic Principles of Inheritance with a free chapter-wise online MCQ test.
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.
Chapter 6: Basic Principles of Inheritance — Important Questions & Answers
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.
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.
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.
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.
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.
A monohybrid cross between heterozygotes (Aa × Aa) produces genotypes AA, Aa, and aa in the ratio 1:2:1.