1 The term 'gene' was first used by
A Johannsen
B Mendel
C Lemark
D Cuvier
Answer: Option [A]
2 Wilkins X-ray diffraction showed the diameter of the DNA helix as
A 10A
B 20A
C 30A
D 40A
Answer: Option [B]
3 The number of autosomes in man is
A 22 pairs
B 11 pairs
C 43 pairs
D 23 pairs
Answer: Option [A]
4 A normal metaphase chromosome with a midial centromere is:
A metacentric
B sub-metacentric
C acrocentric
D telocentric
Answer: Option [A]
5 Lampbrush chromosomes are found inside
A Salvary glands of Drosophila
B Salvary gland of silk moth
C Oocytes of frog
D Nucleus of man
Answer: Option [C]
6 The chromosomes as thread like structures in nucleus was first described by:
A Mendel
B Strasburger
C Darwin
D Levitzky
Answer: Option [B]
7 Genes are made up of:
A Histones
B Lipoproteins
C Polynucleotides
D Hydrocarbons
Answer: Option [C]
8 The function of chrosomes of carrying genetic information from cell generation to another is performed by:
A RNA
B DNA
C Histones
D Calcium
Answer: Option [B]
9 In chrosomes, the material controlling heredity is
A DNA
B Histones
C Chromocentres
D RNA
Answer: Option [A]
10 The term 'gene' refers to:
A A portion of RNA
B A linkage group
C A portions of DNA
D A sequence of Amino
Answer: Option [C]
11 Nobel prize to Komberg and Ochoa was given for
A Artificial synthesis of genes
B Chemistry of DNA and RNA
C One gene one enzyme hypothesis
D Artificial sysnthesis of DNA
Answer: Option [D]
12 The chromosomes except those relating to sex are known as:
A Heterosomes
B Autosomes
C Allosomes
D Cytosomes
Answer: Option [B]
13 Chromosome set in zygote is
A 2n
B 1n
C 3n
D 4n
Answer: Option [A]
14 Number of autosome in a normal female is:
A 21
B 22
C 23
D 44
Answer: Option [D]
15 Homologous chrosomes which are present in male and female both are known as:
A Heterosomes
B Replosomes
C Androsomes
D Autosomes
Answer: Option [D]
16 A chromosome with centromere near the middle is called
A metacentric
B submetacentric
C acrocentric
D telocentric
Answer: Option [B]
17 X-chrosome is
A Telocentric
B Submetacentric
C Acrocentric
D Acentric
Answer: Option [B]
18 Y-chromosome is
A Acrocentric
B Telocentric
C Submetacentric
D Acentric
Answer: Option [A]
19 A giant chromosome with a number of chromonemeta is
A Lampbrush chromosome
B Hetero chromosome
C Supernumerary chromosome
D Polytene chromosome
Answer: Option [D]
20 Chromatid is
A one half of chromosome
B haploid chromosome
C complete chromosome
D duplicate chromosome
Answer: Option [A]
21 A gene is said to be dominant, if
A It is never expressed in any condition
B It is expressed only in heterozygous
C It expresses its effect only in heterozygous state
D It is expressed both in heterozygous and heterozygous condition
Answer: Option [D]
22 Laws of segregation and dominance were given by
A Darwin
B Morgan
C Mendel
D De Vries
Answer: Option [C]
23 Segregation of alleles takes place during
A Cleavage
B Melosis
C Fertilization
D Non-disjunction
Answer: Option [B]
24 The sum of genes in a population is called
A Genotype
B Karyotype
C Gene pool
D Lethal gene
Answer: Option [C]
25 If two opposite alleles come together, one finding morphological expression masking the other, the fact is described as law of
A Inheritance
B Dominance
C Limiting factor
D Segregation
Answer: Option [B]
26 When an allele fails to express itself in presence of the other allele, the former is said to
A Recessive
B Dominant
C Codominant
D Complementary
Answer: Option [A]
27 A pair of contrasting character is termed as
A Allelomorphs
B Homozygous
C Heterozygous
D Polymorphs
Answer: Option [A]
28 The haploid condition is found in
A Amoeba
B Bacteria
C Ovum
D Zygote
Answer: Option [C]
29 The character which appears physically in an animal is
A Genotype
B Phenotype
C Heterotype
D Morphozygous
Answer: Option [B]
30 The frequency of a character is found to be increasing when
A It is dominant
B It is recessive
C It is adaptable
D It is inheritable
Answer: Option [D]
31 How many nucleosomes are found in helical coil of 30 nm chromatin fibre?
A 10
B 12
C 06
D 09
Answer: Option [C]
32 If the number of chromosomes in most body cells of a mammal is 40, the cells in the seminiferous tubule will have
A 40 chromosomes
B 20 chromosomes
C 10 chromosomes
D While some other will have 20
Answer: Option [D]
33 Balbiani discovered special type of chromosome from the salvary gand of chironomus larva which are recognized by the presence of
A Bands
B Loops
C Both bands and loops
D All of the above
Answer: Option [C]
34 A cistron is
A Structural of gene
B Functional unit of RNA
C Functional unit gene
D Replication unit of gene
Answer: Option [C]
35 Genetic information are carried in the form of long chain of molecules made-up-of
A Amino acids
B RNA
C Nucleotides
D Polypeptides
Answer: Option [C]
36 Arrangement of chromosomes in the order of decreasing length is termed as
A Pedigree
B Eugenetics
C Idiogram
D Dysengenics
Answer: Option [C]
37 Traits controlled by genes located on autosomes are said to be
A sex affected
B sex influenced
C sex linked
D genetic traits
Answer: Option [D]
38 Tjio and Levan's contribution is very significant because they
A gave the number of human chromosomes
B pointed out mutational changes
C identified barr bodies
D detected sex linkage
Answer: Option [A]
39 Polytene or giant chromosomes are found in
A Salvary glands of man
B Salvary glands of woman
C Salvary glands of all animals
D Salvary glands of Drosophila
Answer: Option [D]
40 Telocentric chromosome differs from acrocentric chromosome in that
A The former has subterminal centromere whereas the later has a centrally located centrosome
B The centromere in the former is terminal and the later is subterminal
C The former has a terminal centromere and the later has a medially located centromere
D None of the above
Answer: Option [B]
41 The grouping of human chromosomes is based on
A Secondary constrictions alone
B Dot like satellites alone
C Banding pattern alone
D All the above
Answer: Option [C]
42 The gene which increases the frequency of mutation in other is referred to as
A Mutator gene
B Mutagene
C Hypostatic gene
D Complementary gene
Answer: Option [A]
43 Two allelic genes are located on
A The same chromosomes
B Two homologous chromosomes
C Two non-homologous chromosomes
D Any two chromosomes
Answer: Option [B]
44 The frequency of an allele in an isolated population may change due to
A gene flow
B mutation
C genetic drift
D natural selection
Answer: Option [C]
45 Number of autosmes in human sperm is
A 11
B 22
C 44
D 45
Answer: Option [B]
46 Relative morphologies of chromosome of an individual indicates his/her
A Genotype
B Phenotype
C Pedigree chart
D Karyotype
Answer: Option [D]
47 The smallest portion of gene which is responsible for mutation is called as:
A Operon
B Codon
C Recon
D Muton
Answer: Option [D]
48 Each chromosome carries a distinct region which plays a fundamental role in chromosome movements during mitosis is
A Centromere or kinetochore
B Telomere
C Centriole
D Chromatid
Answer: Option [A]
49 The terminal end of a chromosome is called
A Centromere
B Chromomere
C Telomere
D Metamere
Answer: Option [C]
50 Where is the genetic information in body contained
A Structural proteins
B Enzymes
C DNA
D Enzymes and DNA
Answer: Option [C]
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