71.
The smallest unit of genetic material which upon mutation produce a phenotypic effect is
A
Mutons
B
Inducer gene
C
Mutator gene
D
Regulator gene
Answer :
Mutons
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72.
A giant rat is formed in the laboratory, what is thereason
A
Gene mutation
B
Gene synthesis
C
Gene manipulation
D
Gene replication
Answer :
Gene manipulation
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73.
What map unit (Centimorgan) is adopted in the construction of genetic maps?
A
A unit of distance between two expressed genes, representing 10% cross over
B
A unit of distance between two expressed genes, representing 100% cross over
C
A unit of distance between genes on chromosomes, representing 1% cross over
D
A unit of distance between genes on chromosomes, representing 50% cross over
Answer :
A unit of distance between genes on chromosomes, representing 1% cross over
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74.
Of a normal couple, half the sons are haemophilic while half the daughters are carriers. The gene is located on
A
$$X$$-chromosome of father
B
$$Y$$-chromosome of father
C
one $$X$$-chromosome of mother
D
both the $$X$$-chromosomes of mother
Answer :
one $$X$$-chromosome of mother
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75.
Which of the following genotype represent intersex Drosophila
A
2A + XXX
B
2A + XXY
C
3A + XXY
D
2A + XY
Answer :
3A + XXY
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76.
Haploids are preferred over diploids for mutation studies because in haploids
A
recessive mutations express immediately
B
dominant mutations express immediately
C
mutations are readily induced
D
tissue culture is easy
Answer :
recessive mutations express immediately
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77.
Down's syndrome is due to
A
crossing over
B
linkage
C
sex-linked inheritance
D
nondisjunction of chromosomes
Answer :
nondisjunction of chromosomes
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78.
Polyethylene glycol method is used for it
A
Energy production from sewage
B
Gene transfer without a vector
C
Biodiesel production
D
Seedless fruit production
Answer :
Gene transfer without a vector
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79.
Back cross is a cross between
A
F1 x F1
B
F1 xRecessive
C
F1 x Dominant
D
F1 x any parent
Answer :
F1 x any parent
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80.
What is an auxotroph
A
A plant that responds by bending towards the sun
B
A mutant (organism) which has lost its ability to synthesize one or more essential compounds
C
An organism that depends on another organism for meeting its nutritional requirements
D
A plant that is able to synthesize its own Carbohydrates
Answer :
A mutant (organism) which has lost its ability to synthesize one or more essential compounds
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