Genetics MCQs

Genetics deals with the study of genes, genetic variations and heredity in organisms. It was discovered by Gregor Mendel who studied the inheritance patterns in a pea plant. The trait which made up the phenotype of the offspring was the dominant trait, while the other one was a recessive trait. Given below are a few Genetics MCQs which will help the students analyse their conceptual knowledge. The answers are also provided for your reference.

MCQs on Genetics

1. The tendency of an offspring to resemble its parent is known as

1. Variation

2. Heredity

3. Resemblance

4. Inheritance

Also read: Heredity

2. Who is known as the “Father of Genetics”?

1. Morgan
2. Mendel
3. Watson
4. Bateson

Also read: Genetics

3. The alternate form of a gene is

1. Alternate type
2. Recessive character
3. Dominant character
4. Allele

4. The genotypic ratio of a monohybrid cross is

1. 1:2:1
2. 3:1
3. 2:1:1
4. 9:3:3:1

Also read: Monohybrid cross

5. The crossing of F1 to either of the parents is known as

1. Test cross
2. Back cross
3. F1 cross
4. All of the above

6. Which of the following statements is true regarding the “law of segregation”?

1. Law of segregation is the law of purity of genes
2. Alleles separate from each other during gametogenesis
3. Segregation of factors is due to the segregation of chromosomes during meiosis
4. All of the above

Also read: Law of segregation

7. Homozygosity and heterozygosity of an individual can be determined by

1. Back cross
2. Self-fertilization
3. Test cross
4. All of the above

8. An exception to Mendel’s law is

1. Independent assortment
2. Linkage
3. Dominance
4. Purity of gametes

Also read: Mendel’s Laws of Inheritance

9. Pea plants were used in Mendel’s experiments because

1. They were cheap
2. They had contrasting characters
3. They were available easily
4. All of the above

10. The smallest unit of genetic material which produces a phenotypic effect on mutation is

1. Muton
2. Gene
3. Recon
4. Nucleic acid

Also read: Difference between genotype and phenotype

11. Mendel’s findings were rediscovered by

1. Correns
2. De Vries
3. Tschermark
4. All

12. Alleles are

1. Alternate forms of genes
2. Linked genes
3. Chromosomes that have crossed over
4. Homologous chromosomes

Also read: Difference between gene and allele

13. When the activity of one gene is suppressed by the activity of a non-allelic gene, it is known as

1. Pseudo-dominance
2. Hypostasis
3. Epistasis
4. Incomplete dominance

Also read: Incomplete Dominance

14. Cystic fibrosis is

1. Sex-linked recessive disorder
2. Autosomal dominant disorder
3. Autosomal recessive disorder
4. Sex-linked dominant disorder

Also read: Genetic Disorders

15. 9:7 ratio in the F2 generation represents

1. Incomplete dominance
2. Co-dominance
3. Epistasis
4. Complementary interaction

16. A small amount of lethal mutation is always present in the population due to

1. Positive selection
2. Negative selection
3. Frequency-dependent selection
4. Mutation-selection balance

17. If a plant with genotype AaBb is self-fertilized, the probability of getting AABB genotype will be (A and B are not linked)

1. ½
2. ¼
3. ⅛
4. 1/16

18. How many phenotypes can occur in the human blood group ABO with alleles I^A I^B i?

1. 2
2. 3
3. 4
4. 1

Also read: Blood Groups

19. The geometrical device that helps to find out all the possible combinations of male and female gametes is known as

1. Bateson Square
2. Mendel Square
3. Punnett Square
4. Mendel’s Cube

20. Which term represents a pair of contrasting characters?

1. Heterozygous
2. Homozygous
3. Codominant genes
4. Allelomorphs

Answer Key

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