Genetic Concepts & Terms – Old Year Questions

1. Who is the father of modern genetics?

(a) Gregor Johann Mendel
(b) Hugo De Vries
(c) Charles Darwin
(d) Thomas Hunt Morgan

[Chhattisgarh P.C.S. (Pre) 2011]


2. The classical Mendel’s work on his ‘laws of inheritance’ was performed on the organism –

(a) Drosophila
(b) Snapdragon
(c) Garden pea
(d) Sweet Pea

[U.P.P.C.S. (Mains) 2002]


3. Mendel’s principle of inheritance is based on-

(a) Vegetative reproduction
(b) Asexual reproduction
(c) Sexual reproduction
(d) All of the above

[53rd to 55th B.P.S.C. (Pre) 2011]


4. Genome mapping relates to :

(a) Blood grouping
(b) Mapping of genes
(c) Mapping of nerve centers
(d) Mapping of brain

[U.P.P.C.S. (Pre) 2002]


5. The unit of heredity in our body is called

(a) Chromosome
(b) DNA
(c) Gene
(d) Nucleus

[U.P.P.S.C. (GIC) 2010]


6. Gene is

(a) A segment of DNA
(b) A segment of DNA and histone
(c) A segment of DNA, RNA, and histone
(d) All of the above

[Uttarakhand P.C.S. (Pre) 2016]


7. The characteristics features of the genetic code are :

i. It is always universal
ii. It is a triplet of nucleotide bases corresponding to 20 amino acids
iii. It is non-overlapping, non-ambiguous, and commaless.
iv. It has a start and stop codon

Which of the statements given above are true?

(a) i, ii, and iv only
(b) i, iii, and iv only
(c) i, ii, and iii only
(d) All of the above

[M.P. P.C.S. (Pre) 2020]


8. Change in the base sequence within a gene is called:

(a) Mutation
(b) Cloning
(c) Fusion
(d) Breeding

[U.P.P.C.S. (Pre) 2020]


9. Hereditary symptoms are moved in the descendant of creatures by

(a) Ribosome
(b) Chromosome
(c) Plasma
(d) Lysosome

[R.A.S./R.T.S. (Pre) 1992]


10. Which of the following is responsible for controlling the hereditary characteristics of the living cells?

(a) Enzyme
(b) Hormone
(c) RNA
(d) DNA
(e) None of the above/More than one of the above

[60th to 62nd B.P.S.C. (Pre) 2016]


11. Which of the following features of DNA makes it uniquely suited to store and transmit genetic information from generation to generation?

(a) Complementarity of the two strands
(b) Double helix
(c) Number of base pairs per turn
(d) Sugar-phosphate backbone

[I.A.S. (Pre) 2001]


12. Sexual reproduction causes genetic variation because of

(a) Blending of genes
(b) Chromosomal changes
(c) Shuffling of genes
(d) All of the above

[53rd to 55th B.P.S.C. (Pre) 2011]


13. Chromosomal theory of inheritance was given by 

(a) Waldeiyer
(b) Mendel
(c) Sutton and Boveri
(d) Muller

[Jharkhand P.C.S. (Pre) 2021]


14. Who first outlined the structure of the gene molecule (D.N.A.)?

(a) Dr. Maghnad Saha
(b) Dr. Stephan Hawking
(c) Dr. James Watson and Dr. Francis Crick
(d) Dr. Alexander Fleming

[M.P.P.C.S. (Pre) 1994]


15. James D. Watson and Francis Crick are associated with the discovery of

(a) Vaccine
(b) Structure of DNA
(c) Anti-malarial drugs
(d) Penicillin

[U.P.P.C.S. (Mains) 2012]


16. Who has proposed for the first time the double helix model of DNA?

(a) Watson and Crick
(b) Fisher the Haldoni
(c) Lamark and Darwin
(d) Hugo de Vries

[U.P.P.C.S.(Pre) 2012]


17. Nobel Prize-winning scientist James D. Watson is known for his work in which area?

(a) Metallurgy
(b) Meteorology
(c) Environmental protection
(d) Genetics

[I.A.S. (Pre) 2008]


18. Double-helical structure of DNA was given by whom?

(a) Jacob and Monod
(b) Watson and Crick
(c) H.G. Khorana
(d) None of the above

[U.P. P.C.S. (Pre) 2018]


19. Who discovered DNA?

(a) James Watson and Francis Crick
(b) Gregor Mendel
(c) Johannsen
(d) Hargovind Khorana
(e) None of the above/More than one of the above

[64th B.P.S.C. (Pre) 2018]


20. Har Gobind Khorana is credited for the discovery of 

(a) Synthesis of Protein
(b) Synthesis of gene
(c) Synthesis of Nitrogenous
(d) None of these

[39th B.P.S.C. (Pre) 1994]


21. In the laboratory, who did the synthesis of DNA –

(a) Miller
(b) Khorana
(c) D. Weris
(d) Kelvin

[43rd B.P.S.C. (Pre) 1999]


22. Who delivered the principle of ‘jumping genes’?

(a) Gregor Johann Mendel
(b) Tomas Hunt Morgan
(c) Barbara McClintock
(d) Watson and Crick

[I.A.S. (Pre) 1993]


23. Which compound present in D.N.A. does not form an amino acid?

(a) Adenine
(b) Tyrosine
(c) Guanine
(d) Cytosine

[U.P.P.C.S. (Pre) 1994]


24. The sugar present in DNA is :

(a) Glucose
(b) Fructose
(c) Deoxyribose
(d) Ribose

[U.P. P.C.S. (Mains) 2016]


25. Ribozymes are :

(a) DNA
(b) RNA
(c) Proteins
(d) None of these

[Jharkhand P.C.S. (Pre) 2016]


26. Chromosome number in any species :

(a) increase by age
(b) decrease by age
(c) is constant
(d) increase with the weight

[Chhattisgarh P.C.S. (Pre) 2019]


27. Which of the following does not have a sex chromosome?

(a) Monkey
(b) Tiger
(c) Butterfly
(d) Lizard

[U.P.P.C.S. (Spl) (Mains) 2004]


28. How many chromosomes are there in humans?

(a) 36
(b) 46
(c) 56
(d) 25

[U.P.P.C.S. (Pre) 1992 , U.P.P.C.S. (Pre) 1991]


29. The number of chromosome pairs, found in the cells of the human body is –

(a) 21
(b) 22
(c) 23
(d) 24

[Uttarakhand P.C.S. (Pre) 2003]


30. Assertion (A): In human beings, the females play a major role in determining the sex of the offspring.

 Reason (R): Women have two `X’ chromosomes.

Code :

(a) Both (A) and (R) are true and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true but (R) is not a correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.

[I.A.S. (Pre) 2000]


31. Male’s gene constituent is –

(a) XX
(b) XY
(c) X
(d) Y

[43rd B.P.S.C. (Pre) 1999]


32. Which combination of chromosomes in mankind gives birth to a male child?

(a) X of male and X of female
(b) X of male and Y of female
(c) Y of male and X of female
(d) Y of male and Y of female

[M.P.P.C.S. (Pre) 2005]


33. Which of the following professional(s) are more likely to run the risk of a permanent change in their cell’s DNA?

1. Researchers using carbon 14 isotope
2. X-ray technician
3. Coal miner
4. Dyer and painter

Select the correct answer by using the codes given below :

Code :

(a) 2 only
(b) 1, 2, and 3
(c) 1, 2 and 4
(d) 1, 3, and 4

[I.A.S. (Pre) 1996]