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Q. No.Read the following statements (a-c) with respect to gene flow and choose the correct option
1. (a) and (b) are correct
2. (b) and (c) are correct
3. (a) and (c) are correct
4. Only (c) is correct
| a: | Gene flow occurs through migration of individuals |
| b: | Does not affect allele frequencies in the original population |
| c: | Gene flow changes allele frequencies in the new population |
2. (b) and (c) are correct
3. (a) and (c) are correct
4. Only (c) is correct
Subtopic: Â Hardy Weinberg Law |
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Which of the following can be random processes?
1 genetic drift
2 mutations
3 artificial selection
1. 2 and 3 only
2. 1, 2 and 3
3. 1 and 2 only
4. none of them
Subtopic: Â Hardy Weinberg Law |
 77%
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The increase in the frequency of one phenotype in a wild population of fish could be due to:
a. an advantageous mutation.
b. increased reproductive success of individuals with that phenotype.
c. a change in the environment.
1. c only
2. a and b only
3. a, b and c
4. b and c only
Subtopic: Â Hardy Weinberg Law |
 74%
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Assertion(A): Gene flow increases genetic variations.
Reason(R): Random introduction of new alleles into recipient population and their removal from donor population affect allele frequency.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason(R): Random introduction of new alleles into recipient population and their removal from donor population affect allele frequency.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Hardy Weinberg Law: 1 |Â Hardy Weinberg Law: 2 |Â Hardy Weinberg Law |
 65%
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Assertion(A): Branching descent and natural selection are the two key concepts of Darwinian theory.
Reason(R): Hardy-Weinberg's equilibrium is not affected by Darwinian natural selection.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason(R): Hardy-Weinberg's equilibrium is not affected by Darwinian natural selection.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Darwin's Theory |Â Summary of Darwin's Theory |Â Drawbacks of Darwin's Theory |Â Hardy Weinberg Law: 1 |Â Hardy Weinberg Law: 2 |Â Hardy Weinberg Law |
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Assertion (A): The probability of genotype Aa is 2pq in the Hardy-Weinberg population.
Reason (R): Hardy-Weinberg equilibrium, p2 +2pq+q2=1.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason (R): Hardy-Weinberg equilibrium, p2 +2pq+q2=1.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Â Hardy Weinberg Law |
 55%
From NCERT
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Q. No.
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