271.
Which of the following cuts the DNA from specific places A
Restriction endonuclease (E-Co-RI)
B
Ligase
C
Exonuclease
D
Alkaline phosphate
Answer :
Restriction endonuclease (E-Co-RI)
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272.
Which one of the following conditions correctly describes the manner of determining the sex in the given example? A
Homozygous sex chromosomes $$(ZZ)$$ determine female sex in birds
B
$$XO$$ type of sex chromosomes determine male sex in grasshopper
C
$$XO$$ condition in human as found in Turner syndrome, determines female sex
D
Homozygous sex chromosomes $$(XX)$$ produce male in Drosophila
Answer :
$$XO$$ type of sex chromosomes determine male sex in grasshopper
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273.
The percentage of ab gametes produced by Aa Bbparent will be A
12.5
B
25
C
50
D
75
Answer :
25
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274.
A gene is said to be dominant if A
it expresses its effect only in homozygous state
B
it expresses its effect only in heterozygous condition
C
it expresses its effect both in homozygous and heterozygous condition
D
it never expresses its effect in any conditions
Answer :
it expresses its effect both in homozygous and heterozygous condition
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275.
Which one of the following scientist's name is correctly matched with the theory put forth by him A
De Vries - Natural selection
B
Mendel - Theory of pangenesis
C
Weismann - theory of continuity of Germplasm
D
Pasteur - Inheritance of acquired characters
Answer :
Weismann - theory of continuity of Germplasm
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276.
Which of the following is most difficult to detect A
Auxotrophic mutation
B
Lethal mutation
C
Recessive non-lethal mutation
D
Dominant mutation
Answer :
Recessive non-lethal mutation
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277.
Which one was absent in the atmosphere at the time of origin of life A
NH3
B
H2
C
O2
D
CH4
Answer :
O2
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278.
In Mendel's experiment with garden pea, round seed shape $$(RR)$$ was dominant over wrinkled seeds $$(rr),$$ yellow cotyledon $$(YY)$$ was dominant over green cotyledon $$(yy).$$ What are the expected phenotypes in the $${F_2}$$ generation of the cross $$RRYY \times rryy?$$ A
only wrinkled seeds with yellow cotyledons
B
only wrinkled seeds with green cotyledons
C
Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
D
only round seeds with green cotyledons
Answer :
Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
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279.
Point mutation is induced by A
Adenine
B
Guanine
C
3-cytosine
D
Bromouracil
Answer :
Bromouracil
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280.
In Drosophilex index of super female is A
1
B
0.5
C
1.5
D
0.67
Answer :
1.5
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