Q. No.
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In allopatric speciation, reproductive isolation is initially caused by:
| 1. | behavioral barriers | 2. | postzygotic barriers |
| 3. | geographic barriers | 4. | ecological barriers |
The most critical evolutionary process, that leads to changes in allele frequencies and favors or promotes adaptation as a product of evolution, is :
| 1. | Genetic drift | 2. | Gene migration |
| 3. | Mutation | 4. | Natural selection |
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The differential success in the reproduction, of an organism, in a given environment, is :
| 1. | Adaptation | 2. | Natural Selection |
| 3. | Adaptive radiation | 4. | Saltatory evolution |
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Identify the incorrect statement:
| 1. | Neanderthals lived between 1,50,000 and 1,00,000 years back. |
| 2. | Modern Homo sapiens arose between 75000 and 10000 years ago. |
| 3. | Pre-historic cave art developed around 18000 years ago. |
| 4. | Agriculture came around 10000 years ago. |
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A population geneticist finds that a new allele in a population has suddenly increased in frequency. Most likely this allele is:
1. mutating rapidly
2. flowing with emigrants
3. strongly selected for
4. a product of assortative mating
An island population faced a natural calamity and the population crashed to only 30 organisms. After some time the number of organisms grew to 5000 but still the threat of extinction is large. This is most likely due to:
| 1. | Founder effect | 2. | Bottleneck effect |
| 3. | Edge effect | 4. | Heterosis |
The number of individuals expressing the dominant phenotype in a population of 200 is 182. What is the frequency of the dominant allele in this population?
| 1. | 9 % | 2. | 30 % |
| 3. | 91 % | 4. | 70 % |
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Though we cannot be certain, what can be the probable reason/s for the sudden disappearance of dinosaurs from the Earth?
| I: | Climatic changes killed them |
| II: | Most of them evolved into birds |
| 1. | I only | 2. | II only |
| 3. | Both I and II | 4. | Neither I nor II |
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In some African populations, the frequency of the sickle cell allele in the human population is much higher than normal. This can be an example of:
| 1. | gene flow | 2. | heterozygote advantage |
| 3. | genetic drift | 4. | nonrandom mating |
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