TNPSC Biology - Genetics
Exam Duration: 45 Mins Total Questions : 30
Mendel selected pea plant for his experiment because
- (a)
they are cheaper
- (b)
these are easily available
- (c)
these are of great economic importance
- (d)
they have contrasting traits
Haemophilia is a genetic disorder which lead to
- (a)
the decrease in hemoglobin level
- (b)
rheumatic heart disease
- (c)
The decrease in WBC
- (d)
non-clotting of blood
Gregor Johann Mendel is famous for
- (a)
Cell theory
- (b)
Mutation principle
- (c)
Law of heredity
- (d)
Heredity of acquired characters.
Which of the following is the X-Linked genetic disease?
- (a)
Becker's muscular dystrophy
- (b)
Daltonism color Blindness
- (c)
Martin-Bell syndrome
- (d)
All of the above
Which of the following techniques can be used to establish the paternity of a child?
- (a)
Protein analysis
- (b)
Quantitative analysis of DNA
- (c)
Chromosome Counting
- (d)
DNA fingerprinting
In genetic dictionary, there are 64 codons as
- (a)
64 amino acids are to be coded
- (b)
64 types of tRNA are present
- (c)
there are 44 non-sense codons and 20 sense codons
- (d)
the genetic code is a triplet
Which one of the following is not a genetic disorder?
- (a)
color Blindness
- (b)
Down's Syndrome
- (c)
Haemophilia
- (d)
Xerophthalmia
Who is the responsible for the sex determination of a child?
- (a)
Father
- (b)
Mother
- (c)
Both a and b
- (d)
None of these
By which combination of the chromosome, a child will be male?
- (a)
X from male and X from female
- (b)
X from male and Y from female
- (c)
Y from male and X from female
- (d)
Y from male and Y from female
The number of DNA molecules per chromatids are
- (a)
one
- (b)
two
- (c)
three
- (d)
four
Which of the following viruses have RNA as the genetic material?
1. Polio-viruses
2. Reo-viruses
3. Adeno-viruses
4. TMV
- (a)
1,2,3 and 4
- (b)
1,2 and 4
- (c)
2,3 and 4
- (d)
3 and 4
In prokaryotes, multiple ribosomes (polysomes) participate in
- (a)
translation process
- (b)
transcription process
- (c)
linkage
- (d)
crossing over
Consider the following statements:
1. A test cross is used to determine as unknown genotype within one breeding generation.
2. A test cross is a cross between, F1 hybrid and dominant parent.
3. A test cross is a cross between, F1 hybrid and recessive parent.
Which of the statements given above are false about test cross?
- (a)
Only 1
- (b)
Only 2
- (c)
Only 3
- (d)
1,2 and 3
Match List I(Antibiotics) with List II(Effect) and select the correct answer using the codes given below the lists:
List I | List II |
A. Neomycin | 1. Inhibits interaction between mRNA and tRNA |
B. Streptomycin | 2. Inhibits initiation of translation and causes misreading |
C. Tetracycline | 3. Inhibits binding of tRNA to ribosome |
D. Erythromycin | 4. Inhibit translocation of ribosomes along mRNA. |
- (a)
A B C D 4 1 2 3 - (b)
A B C D 3 4 1 2 - (c)
A B C D 1 2 3 4 - (d)
A B C D 2 3 4 1
Match List I with List II and select the correct answer using the codes given below the lists:
List I | List II |
A. Theory of mutation. | 1. Beadle and Tatum |
B. Theory of evolution | 2. Jacob and Monod |
C. One gene-one enzyme hypothesis | 3. Darwin |
D. Operation concept | 4. De Vries |
- (a)
A B C D 3 4 1 2 - (b)
A B C D 4 3 1 2 - (c)
A B C D 4 3 2 1 - (d)
A B C D 3 4 2 1
Consider the following statements:
1. Polytene chromosomes found in the salivary gland of the larva of Drosophila and Chironomus larva.
2. Discovered by Balbiani.
3. Characterized by the presence of puffs and Balbiani rings.
4. Attach by chromocenter.
which of the statements given above are correct about polytene chromosomes?
- (a)
1 and 2
- (b)
2 and 3
- (c)
Only 2
- (d)
All of these
Which one of the following sets is correctly matched?
1. Diphtheria, Pneumonia, and Leprosy-Hereditary
2. AIDS, syphilis, and gonorrhoea-Bacterial
3. Color blindness, Hemophilia and Sickle cell anaemia-Sex l inked
4. Polio, Japanese-B encephalitis and Plague-Viral
- (a)
Only 2
- (b)
Only 3
- (c)
1 and 4
- (d)
None of these
Consider the following statements:
1. The sugar present in RNA is ribose.
2. The pyrimidines found in RNA are a thymine.
3. The genomic RNA is doubled stranded in wound tumor virus and reovirus.
which of the statements given above are true about RNA?
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
All of these
A normal woman whose father was colorblind is married to a normal man, The sons would be
- (a)
75% Colorblind
- (b)
50% Colorblind
- (c)
All normal
- (d)
All colorblind
Sex-determination by environment factors is commonly observed in
- (a)
Drosophila melanogaster
- (b)
Mirabilis jalapa
- (c)
Melandrium album
- (d)
Bonellia virdis
Consider the following statements:
1. Allosomes, i.e., chromosomes which are responsible for determination of sex, e.g., X and Y-chromosomes.
2. Autosomes, i.e., chromosomes, which have determined the somatic characters.
which of the statements given above are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of these
Gaucher's disease is associated with abnormal metabolism of
- (a)
fat
- (b)
nucleic acid
- (c)
protein
- (d)
carbohydrate
Which of the following is sex-linked inheritance?
- (a)
Thalassemia
- (b)
Phenylketonuria
- (c)
Goitre
- (d)
Haemophilia
Chromosomes be counted best in
- (a)
Metaphase
- (b)
Early prophase
- (c)
Mid prophase
- (d)
Late prophase
Gene located on mitochondrial DNA
- (a)
generally, show maternal inheritance
- (b)
are always inherited from a male parent.
- (c)
show biparental inheritance.
- (d)
are not inherited like the nuclear gene.
Sexual reproduction causes genetic variation because of
- (a)
blending of genes
- (b)
chromosomal changes
- (c)
shuffling of genes
- (d)
all of the above
Which one among the following is not correct about Down's syndrome?
- (a)
It is a genetic disorder
- (b)
Affected individual has early aging
- (c)
Affected person has mental retardation
- (d)
Affected person has furrowed tongue
At present, scientists can determine the arrangement or relative position of genes or DNA sequence on a chromosome. How does this knowledge benefit us?
1. It is possible to know the pedigree of livestock.
2. It is possible to understand the causes of all human diseases
3. It is possible to develop disease-resistant animal breeds.
which of the statements given above are correct?
- (a)
1 and 2
- (b)
Only 2
- (c)
1 and 3
- (d)
1,2 and 3
A married couple adopted a male child. A few years, later twin boys were born to them. The blood group of the couple is AB positive and 'O' negative. The blood group of the three sons is 'A' positive, 'B' positive and 'O' positive. The blood group of the adopted son is
- (a)
O positive
- (b)
A positive
- (c)
B Positive
- (d)
Cannot be determined on the basis of the given data.
A diseased man marries a normal woman and they get three daughters and five sons. All the daughters were diseased and sons were normal. the gene of this disease is
- (a)
sex-linked dominant
- (b)
sex-linked recessive
- (c)
sex-limited character
- (d)
autosomal dominant