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Q. No.Which of the following statement is true about genetic drift?
1. If operates in large populations
2. If always eliminates favourable allele from a population.
3. If work in opposite to natural selection
4. If can not fix non-adaptive trait in a population
Subtopic: Concept of Speciation |
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A: Pre-existing advantageous mutations when selected will result in observation of new phenotype.
R: In small populations natural selection has less role to play in fixing a mutated gene or a gene combination.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: In small populations natural selection has less role to play in fixing a mutated gene or a gene combination.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Hugo De Vries Theory of Evolution | Modern Theory of Evolution |
55%
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A:
Ginkgo
biloba is living fossil.
R: Organism which have persisted and remain unchanged for the past several million years while their relatives disappeared.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Organism which have persisted and remain unchanged for the past several million years while their relatives disappeared.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Palentological Evidences of Evolution |
67%
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A:
Some mutations are spontaneous, others are due to environmental mutagens.
R: Mutations due to replication errors are very rare.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Mutations due to replication errors are very rare.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Modern Theory of Evolution |
65%
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A: Coacervates
are believed to be the precursors of life.
R: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Definition & Types of Evolution | Cosmic Evolution |
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Allopatric speciation
A. New species evolve when one (or) more population of a species becomes separated from the other population of the species due to geographical barrier
B. Small groups of individuals break off from the larger group and form a new species
C. Over the time, cessation of the gene flow between geographically isolated population leads to the reproductive isolation
D. The initial stage of allopatric speciation is polymorphism that does not depend on space within a population
E. As a result of natural selection, geographically separate population become adapted to local conditions and thus they are genetically differentiated
Choose the correct answer from the options given below:
1. A and E only
2. A, E, and C only
3. A, B, and D only
4. A , B, C and E
A. New species evolve when one (or) more population of a species becomes separated from the other population of the species due to geographical barrier
B. Small groups of individuals break off from the larger group and form a new species
C. Over the time, cessation of the gene flow between geographically isolated population leads to the reproductive isolation
D. The initial stage of allopatric speciation is polymorphism that does not depend on space within a population
E. As a result of natural selection, geographically separate population become adapted to local conditions and thus they are genetically differentiated
Choose the correct answer from the options given below:
1. A and E only
2. A, E, and C only
3. A, B, and D only
4. A , B, C and E
Subtopic: Concept of Speciation |
52%
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Even harmful mutations do not get eliminated from the gene pool due to
1. Genetic drift
2. Higher frequency due to dominant nature
3. Being recessive and persisting in heterozygous condition
4. Survival value
1. Genetic drift
2. Higher frequency due to dominant nature
3. Being recessive and persisting in heterozygous condition
4. Survival value
Subtopic: Hardy Weinberg Law |
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Given below are two statements
Statement I : In sympatric speciation, gene flow is reduced by polyploidy, sexual selection and habitat differentiation
Statement II: Hybrid zones, which produce offspring of mixed ancestry, are the predicted outcome when species with incomplete reproductive barrier come into contact with one another.
In light of the above statements, choose the most appropriate answer from the options given below
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Statement I : In sympatric speciation, gene flow is reduced by polyploidy, sexual selection and habitat differentiation
Statement II: Hybrid zones, which produce offspring of mixed ancestry, are the predicted outcome when species with incomplete reproductive barrier come into contact with one another.
In light of the above statements, choose the most appropriate answer from the options given below
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Subtopic: Concept of Speciation |
61%
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What will happen to the population of two forms of Biston betularia (peppered moth) inhabiting the region polluted due to emission of soot from industries?
A. Population of dark colored moth will increase
B. Population of both the forms will decrease
C. Population of light colored moth will increase
D. Population of dark colored moth will increase while the population of light colored moth will decrease
E. Population of both the forms will increase
Choose the correct answer from the options given below:
1. A and D only
2. C, D, and E only
3. C and D only
4. B, C, and D only
A. Population of dark colored moth will increase
B. Population of both the forms will decrease
C. Population of light colored moth will increase
D. Population of dark colored moth will increase while the population of light colored moth will decrease
E. Population of both the forms will increase
Choose the correct answer from the options given below:
1. A and D only
2. C, D, and E only
3. C and D only
4. B, C, and D only
Subtopic: Natural Selection |
91%
From NCERT
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Genetic drift operates in
1. Small isolated population
2. Fast reproductive population
3. Large isolated population
4. Slow reproductive population
1. Small isolated population
2. Fast reproductive population
3. Large isolated population
4. Slow reproductive population
Subtopic: Difference Between Drift & Selection |
83%
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