Unit 3 Chapter 9: Principles of Inheritance and Variation — Online MCQ Test
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.
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.
Unit 3 Chapter 9: Principles of Inheritance and Variation — Important Questions & Answers
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.
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.
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.
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).
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.
Multiple alleles occur in a population as more than two alternate forms of a gene, but each diploid individual carries only two alleles.