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Q. No.Natural selection can lead to:
I:
stabilisation in which more individuals acquire mean character value
II:
directional change in which more individuals acquire value other than the mean character value
III:
disruption in which more individuals acquire peripheral character value at both ends of the distribution curve
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Natural Selection |
88%
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The loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population is called as:
1. Edge effect
2. Genetic bottleneck
3. Founder effect
4. Saltation
1. Edge effect
2. Genetic bottleneck
3. Founder effect
4. Saltation
Subtopic: Hardy Weinberg Law: 2 |
82%
From NCERT
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The frequency of the recessive allele for a trait is recorded to be 0.25 [Assume only two alleles for the gen and complete dominance]. What would the expected frequency of the heterozygotes in this population?
1. 0.0625
2. 0.5625
3. 0.375
4. 0.1875
1. 0.0625
2. 0.5625
3. 0.375
4. 0.1875
Subtopic: Hugo De Vries Theory of Evolution |
69%
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Hugo de Vries believed that:
| 1. | discontinuous variations due to mutations are important for evolution |
| 2. | continuous variations due to recombination are important for evolution |
| 3. | evolution is a function of time |
| 4. | evolution is a deterministic process |
Subtopic: Hugo De Vries Theory of Evolution |
80%
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It is possible that Darwin was influenced by the essay on populations by:
| 1. | Carl Correns | 2. | Charles Lyell |
| 3. | Thomas Malthus | 4. | A. R. Wallace |
Subtopic: Modern Theory of Evolution |
84%
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Consider the given two facts:
What inference/s can be definitely drawn from the given facts?
A. there had been competition for resources
B. the best adapted survive the competition
1. Only A
2. Only B
3. Both A and B
4. Neither A nor B
| I: | Theoretically population size will grow exponentially if everybody reproduced maximally |
| II: | Population sizes in reality are limited |
A. there had been competition for resources
B. the best adapted survive the competition
1. Only A
2. Only B
3. Both A and B
4. Neither A nor B
Subtopic: Population Genetics |
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“Giraffes, in an attempt to forage leaves on tall trees, had to adapt by elongation of their necks and they passed on this acquired character of elongated neck to succeeding generations” – this explanation of long necks can best be ascribed to:
| 1. | Charles Darwin | 2. | Lamarck |
| 3. | Hugo de Vries | 4. | Louis Pasteur |
Subtopic: Theory of Evolution & Lamarckism |
94%
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Consider the given two statements:
Assertion: Natural selection can be regarded as ‘differential reproduction’.
Reason: Nature selects for fitness.
Assertion: Natural selection can be regarded as ‘differential reproduction’.
Reason: Nature selects for fitness.
| 1. | Both Assertion and Reason are true and Reason correctly explains the Assertion. |
| 2. | Both Assertion and Reason are true but Reason does not correctly explain the Assertion. |
| 3. | Assertion is true but Reason is false. |
| 4. | Assertion is false but Reason is true. |
Subtopic: Natural Selection |
From NCERT
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Within the Australian continent marsupials have undergone:
| 1. | disruptive selection |
| 2. | adaptive radiation |
| 3. | extinction |
| 4. | rapid speciation due to sudden large scale mutations |
Subtopic: Genetic Basis of Adaptation |
94%
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Evolution by anthropogenic action:
1. is a determinist process.
2. only leads to evolution of species that are useful to humans.
3. usually is faster than the natural process.
4. is not at all related to mutations
1. is a determinist process.
2. only leads to evolution of species that are useful to humans.
3. usually is faster than the natural process.
4. is not at all related to mutations
Subtopic: Palentological Evidences of Evolution |
61%
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