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Q. No.The ultimate source of allelic variations in a population is:
1. Recombination
2. Mutation
3. Genetic drift
4. Gene flow
Subtopic: Population Genetics |
56%
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The frequency of an allele in a population is ultimately decided by:
| 1. | Dominance |
| 2. | Whether it is autosomal linked or sex linked |
| 3. | Forces such as natural selection |
| 4. | The number of alleles present for a particular gene |
Subtopic: Natural Selection |
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Which of the following types of natural selection narrows the phenotypic range by selecting against phenotypic extremes?
1. disruptive selection.
2. stabilizing selection.
3. directional selection.
4. neutral selection.
1. disruptive selection.
2. stabilizing selection.
3. directional selection.
4. neutral selection.
Subtopic: Hardy Weinberg Law: 1 |
55%
From NCERT
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Consider the given two statements:
| Assertion (A): | Variations on which natural selection acts, arise as a result of random mutations. |
| Reason (R): | A new variation may, or may not, be adaptive. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | (A) is False and (R) is also False. |
| 4. | (A) is True but (R) is False. |
Subtopic: Darwin's Theory |
53%
From NCERT
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Consider the given two statements:
| Assertion: | The hemoglobin gene is less similar between humans and gorilla than between humans and chimpanzees. |
| Reason: | Humans and chimpanzees have a more recent common ancestor than human and gorilla. |
| 1. | Both Assertion and Reason are true but the Reason does not correctly explain the Assertion. |
| 2. | Both Assertion and Reason are true and the Reason correctly explains the Assertion. |
| 3. | Assertion is false and Reason is also false. |
| 4. | Assertion is true but Reason is false. |
Subtopic: Evolution Prior to Ape Man: 2 |
72%
From NCERT
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Consider the given two statements:
| Assertion: | The presence of gill slits and a tail in the early stages of development of an embryo indicates that it can develop only as a fish. |
| Reason: | Embryos pass through the adult stages of other animals. |
| 1. | Both Assertion and Reason are true but the Reason does not correctly explain the Assertion. |
| 2. | Both Assertion and Reason are true and the Reason correctly explains the Assertion. |
| 3. | Assertion is false and Reason is also false. |
| 4. | Assertion is true but Reason is false. |
Subtopic: Embryological Evidence of Evolution |
64%
From NCERT
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Over time, all the following characters in the lineage of horse have shown an increasing trend except:
1. digit number
2. body size
3. tooth length
4. tooth size
1. digit number
2. body size
3. tooth length
4. tooth size
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
63%
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If we say that the embryos of reptiles, birds, and mammals look very similar during their early stages of development, this would suggest that these organisms:
1. have stopped evolving
2. have a common ancestor
3. live in the same types of environments
4. will get extinct if the environment changes
1. have stopped evolving
2. have a common ancestor
3. live in the same types of environments
4. will get extinct if the environment changes
Subtopic: Embryological Evidence of Evolution |
92%
From NCERT
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In 1938, a fish caught in South Africa which was thought to be extinct, was a:
| 1. | Jawless fish | 2. | Armoured fish |
| 3. | Lobe finned fish | 4. | Ray finned fish |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
74%
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Which of the following periods in geological time scale is not included in the Palaeozoic era?
1. Silurian
2. Cretaceous
3. Devonian
4. Carboniferous
1. Silurian
2. Cretaceous
3. Devonian
4. Carboniferous
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
75%
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