Question Bank on Genetics (With Answers)!
1. The term polygenes was coined by which of the following
(A) Jink
(B) Mather
(C) East
(D) Nilsson-Ehle
Ans. B
2. The coupling and repulsion phase terms was first described by which of the following
(A) Bridges
(B) Bateson and Punnett
(C) Sturtvent
(D) Morgan
Ans. B
3. Crossing over occurs during which of the following
(A) Pachytene
(B) Zygotene
(C) Diplotene
(D) Leptotene
Ans. A
4. In which of the following sub-stages of meiosis-I, chromatin exchange between non sister chromatids begins
(A) Diakinesis
(B) Diplotene
(C) Pachytene
(D) Zygotene
Ans. D
5. The phenomenon of transformation was first discovered by which of the following
(A) Griffing
(B) Griffith
(C) Garrod
(D) Koch
Ans. B
6. During 1946, which of the following scientists first demonstrated sexuality (conjugation) in bacteria
(A) Jacob and Wollman
(B) Lederberg and Tatum
(C) Luria and Delbruck
(D) Hershey and Bailey
Ans. B
7. Which of the following scientists reported the first case of sex linkage
(A) Bridges
(B) Me Clung
(C) Morgan
(D) Sturtvent
Ans. C
8. Genie balance theory of sex determination was proposed by, which of the following
(A) Stevens
(B) Morgan
(C) Bridges
(D) Sturtvent
Ans. C
9. Alleles that are similar in their effects on a character are termed as which of the following
(A) Isoalleles
(B) Polygenes
(C) Pseudoalleles
(D) Multiple alleles
Ans. A
10. When both the alleles of a gene are fully expressed in the heterozygotes, it leads to which of the following
(A) Codominance
(B) Partial dominance
(C) Pseudo dominance
(D) Over dominance
Ans. A
11. The term cistron was coined by _____
(A) Beadle
(B) Lederberg
(C) Baltimore
(D) Benzer
Ans. D
12. Unequal crossing over may lead to which of the following
(A) Duplication
(B) Mutation
(C) Gene fusion
(D) All of the above
Ans. D
13. Which of the following gene is non functional
(A) Pseudogene
(B) Pseudoallele
(C) Split genes
(D) Multiple allele
Ans. A
14. Processed pseudogenes are derived from which of the following
(A) Pseudogenes
(B) mRNA of split genes
(C) hnRNA
(D) Split genes
Ans. B
15. Genetic material of viroids consists of which of the following
(A) Nucleoprotein
(B) Protein
(C) RNA
(D) DNA
Ans. C
16. A nucleotide consists of which of the following
(A) Base and pentose
(B) Pentose and phosphate
(C) Organic base and phosphate
(D) Base, pentose and phosphate
Ans. D
17. A nucleoside consist of which of the following
(A) Base and pentose sugar
(B) Pentose and phosphate
(C) Organic base and phosphate
(D) Base, pentose and phosphate
Ans. A
18. Phosphodiester bond forms between which of the following
(A) 2’C and 1’C
(B) 5’C and 3’C
(C) 5’C and 2’C
(D) 3’C and 1’C
Ans. B
19. Which of the following forms of DNA has left handed coil
(A) A-DNA
(B) B-DNA
(C) Z-DNA
(D) C-DNA
Ans. C
20. Which form of DNA is common in vivo?
(A) A-DNA
(B) B-DNA
(C) Z-DNA
(D) C-DNA
Ans. B
21. Viral genomes are packaged into which of the following
(A) Nucleoids
(B) Capsules
(C) Capsids
(D) Nuclei
Ans. C
22. What is the DNA content of a somatic cell in G2 phase nucleus?
(A) 2C
(B) 1C
(C) 4C
(D) 8C
Ans. C
23. Which of the following does not have overlapping genes
(A) MS2
(B) SV40
(C) M 13
(D) Phage
Ans. C
24. Who proposed the concept of central dogma?
(A) Watson
(B) Crick
(C) Wilkins
(D) Watson and Crick
Ans. B
25. Which of the following is known as Kornberg enzyme
(A) DNA Polymerase III
(B) DNA Polymerase I
(C) DNA Polymerase II
(D) RNA Polymerase
Ans. B
26. Double helical structure of DNA was shown by _____
(A) Bateson and Punnett
(B) Beadle and Tatum
(C) Jacob and Monad
(D) Watson and Crick
Ans. D
27. DNA can be denatured by heating at a temperature of _____
(A) 72°C
(B) 94°C
(C) 86°C
(D) 90°C
Ans. B
28. Translocation in a cell involves _____
(A) Homologous chromosome
(B) Non-Homologous chromosome
(C) Chromosomes from other species
(D) None of the above
Ans. A
29. Effect of pollen on the character of endosperm is called _____
(A) Metaxenia
(B) Xenia
(C) Epistasis
(D) Hyperxenia
Ans. B
30. The terms recon, muton and cistron was coined in 1957 by _____
(A) Bridges
(B) Muller
(C) Morgan
(D) Benzer
Ans. D
31. Who discovered ‘X-rays’ first?
(A) Wilson
(B) Muller
(C) Roentgen
(D) Benzer
Ans. C
32. Which organelle is having digestive enzyme
(A) Ribosomes
(B) Golgi bodies
(C) Chloroplast
(D) Lysosomes
Ans. D
33. DNA synthesis will take place in which stage
(A) G1
(B) G2
(C) S
(D) None
Ans. C
34. Okazaki fragments are formed due to synthesis of DNA in direction of _____
(A) 5′-3′
(B) 3′-5′
(C) Both A and B
(D) None
Ans. A
35. In DNA double helix, G/A is equal to _____
(A) C/T
(B) T/A
(C) C/A
(D) C/G
Ans. A
36. The number of bases in a single turn of the DNA helix
(A) 5
(B) 10
(C) 7
(D) 12
Ans. B
37. Concept of ‘epigenesis’ was proposed by _____
(A) Robinson
(B) Tyndall
(C) Jones
(D) Wolf
Ans. D
38. Puffs in polytene chromosomes are the sites of _____
(A) Protein synthesis
(B) DNA synthesis
(C) RNA synthesis
(D) Cell synthesis
Ans. B
39. Inheritance of two characters can be measured by _____
(A) Heritability
(B) Co-heritability
(C) Variability
(D) None of the above
Ans. B
40. tRNA is found in which of the following parts of the cell
(A) ER
(B) Vacuole
(C) Cytoplasm
(D) Golgi body
Ans. C
41. The process of protein synthesis is generally known as which of the following
(A) Transcription
(B) Proteolysis
(C) Protein processing
(D) Translation
Ans. D
42. Which of the following describes the synthesis of messenger RNA
(A) Replication
(B) Transcription
(C) Translation
(D) Transition
Ans. B
43. Which codons usually act as initiation codon?
(A) AUG
(B) UGG
(C) AGA
(D) GAC
Ans. A
44. Which of the following scientists postulated the wobble hypothesis
(A) Watson
(B) Crick
(C) Khorana
(D) Nirenberg
Ans. B
45. Which codons usually act as chain termination codon?
(A) UGA
(B) UAA
(C) AUG
(D) Both A and B
Ans. D
46. The size of ribosome of prokaryote is 70S, which dissociate into which of the following subunits
(A) 50S and 30S
(B) 40S and 30S
(C) 45S and 25S
(D) 50S and 20S
Ans. B
47. Long-lived mRNAs are found in which of the following
(A) Leaves
(B) Seeds
(C) Roots
(D) All of the above
Ans. B
48. In the clover leaf model of tRNA which is the closest to the anticodon loop
(A) Amino acid accepter
(B) Extra loop region
(C) DHU loop
(D) Thymine loop
Ans. B
49. The mutation theory of evolution was proposed by _____
(A) Bridges
(B) Muller
(C) Hugo de vries
(D) Auerbach
Ans. C
50. Which of the following is non Ionizing radiation
(A) Beta-rays
(B) UV rays
(C) Thermal neutrons
(D) X rays
Ans. B
51. The largest number of mutant varieties have been developed in which of the following
(A) Cash crop
(B) Pulses
(C) Oilseeds
(D) Cereals
Ans. D
52. Prabhavati is a mutant variety of _____
(A) Wheat
(B) Bajra
(C) Rice
(D) Sorghum
Ans. C
53. Which of the following scientist reported cytoplasmic male sterility in maize
(A) Roades
(B) Kihara
(C) Lewin
(D) Ramage
Ans. A
54. Hardy-Weinberg law was discovered in which years
(A) 1905
(B) 1908
(C) 1910
(D) 1914
Ans. B
55. Which of the following occurs in small populations
(A) Inbreeding
(B) Random change in gene frequency
(C) Increase in homozygosity
(D) All of the above
Ans. D
56. Term ‘Struggle for existence’ was proposed by _____
(A) Darwin
(B) Lamarck
(C) Lewin
(D) Wallace
Ans. A
57. Which of the following is critical during DNA replication
(A) Ionic interaction
(B) Hydrogen bonds
(C) Covalent bonds
(D) Hydrophobic interaction
Ans. B
58. The smallest unit of genetic material is _____
(A) Intron
(B) Exon
(C) Muton
(D) Recon
Ans. D
59. The largest unit of a gene, which is a unit of function is called _____
(A) Intron
(B) Cistron
(C) Muton
(D) Recon
Ans. B
60. The concept of diallel selective mating was developed by _____
(A) Mather
(B) Jensen
(C) Borlaug
(D) Thoday
Ans. B
61. Random fluctuation in gene frequencies of a population is called _____
(A) Trait drift
(B) Gene drift
(C) Genetic drift
(D) Chromosome drift
Ans. C
62. In 1965, folded fire model of chromosome structure was proposed by _____
(A) Sutton
(B) Donald
(C) DuPraw
(D) Johnson
Ans. C
63. In mitosis the longest phase is _____
(A) Prophase
(B) Metaphase
(C) Anaphase
(D) Telophase
Ans. A
64. Cells without cell wall are known as _____
(A) Protoplast
(B) Protoplastds
(C) Chloroplast
(D) Cybrids
Ans. A
65. DNA as a genetic material was shown by _____
(A) Avery, Macleod and Mc Carty
(B) Watson and Crick
(C) Griffith
(D) Maxam and Gilbert
Ans. A
66. Genetic basis of purelines or pureline theory was proposed by _____
(A) Nilsson-Ehle
(B) Vilmorin
(C) Johannsen
(D) Camerarius
Ans. C
67. The first step in genetic improvement of a plant species is _____
(A) Domestication
(B) Introduction
(C) Selection
(D) Germplasm collection
Ans. A
68. Cereals are deficient in _____
(A) Proline
(B) Methionine
(C) Trptophan
(D) Lysine
Ans. D
69. The ‘father of green revolution’ is _____
(A) B.P. Pal
(B) N.E. Borlaug
(C) M.S. Swaminathan
(D) A. Howard
Ans. B
70. Khesari contains a neurotoxic substance known as _____
(A) Erucic acid
(B) BOAA
(C) Saponin
(D) Glucosinolate
Ans. B
71. The father of Indian green revolution
(A) B.P. Pal
(B) N.E. Borlaug
(C) M.S. Swaminathan
(D) A. Howard
Ans. C
72. The botanical name of Indian cane is _____
(A) Saccharum barberi
(B) Saccharum robusta
(C) Saccharum sinense
(D) Saccharum officinarum
Ans. D
73. The first pigeon pea hybrid is _____
(A) ICPH 8
(B) PPH 4
(C) Co1
(D) H4
Ans. A
74. The first cotton hybrid released in India was _____
(A) Varalaxmi
(B) PPH 4
(C) H6
(D) H4
Ans. D
75. The world’s first high yielding semi-dwarf aromatic rice variety is________
(A) Jaya
(B) Ratna
(C) Taraori Basmati
(D) Pusa Basmati 1
Ans. D
76. The source of reduced height genes used in wheat breeding is _____
(A) Norin 10
(B) Tom Thumb
(C) Dee-geo-woo gene
(D) Norin 10 and Tom Thumb
Ans. D
77. The source of dwarfing gene in rice is _____
(A) Norin 10
(B) Tom Thumb
(C) Dee-geo-woo gene
(D) Kafir-60
Ans. C
78. The National Seeds Corporation was established in the year
(A) 1963
(B) 1966
(C) 1969
(D) 1961
Ans. A
79. Breeder seed has genetic purity of _______
(A) 98%
(B) 99.5%
(C) 100%
(D) 95%
Ans. C
80. Varalaxmi cotton hybrid is derived from the cross between
(A) G.hirsutum x G.hirsutum
(B) G.hirsutum x G.barbadense
(C) G.barbademe x G.barbadense
(D) G.herbaceum x G.herbaceum
Ans. B
81. Tag of which colour is issued for foundation seed
(A) Yellow
(B) White
(C) Blue
(D) Red
Ans. B
82. Tag of which colour is issued for Breeder seed
(A) Yellow
(B) White
(C) Blue
(D) Red
Ans. A
83. Thermo and photo-sensitive genetic male sterility systems were first developed in _____
(A) Wheat
(B) Maize
(C) Rice
(D) Soyabean
Ans. C
84. The maximum heterosis is likely to be manifested in a _____
(A) Single cross
(B) Top cross
(C) Double cross
(D) Double topcross
Ans. A
85. International seed testing association came into existence on _______
(A) 1924
(B) 1928
(C) 1931
(D) 1929
Ans. A
86. Development of seed without sexual process known as ________
(A) Apogamy
(B) Megasporogenesis
(C) Cleistogamy
(D) Microsporogenesis
Ans. A
87. The concepts of centres of origin of crop plants was proposed by _____
(A) N.I. Vavilov
(B) C. Linnaeus
(C) L.R. Harlan
(D) J.B. Hutchinson
Ans. A
88. Seed collections disturbed only for regeneration are called _____
(A) Field collection
(B) Base collection
(C) Working collection
(D) Active collection
Ans. B
89. Land races refers to _____
(A) Obsolete cultivar
(B) Primitive cultivar
(C) Advanced inbred line
(D) None of these
Ans. B
90. Cleistogamy promotes
(A) Self-pollination
(B) Cross pollination
(C) Often cross pollination
(D) All of the above
Ans. A