Q. No.According to Hugo de Vries, the mechanism of evolution is:
1.
Phenotypic variations
2.
Saltation
3.
Multiple-step mutation
4.
Minor mutations
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Among the following sets of examples for divergent evolution, select the incorrect option:
1. Brain of bat, man and cheetah
2. Heart of bat, man and cheetah
3. Forelimbs of man, bat and cheetah
4. Eye of octopus, bat and man
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The similarity of bone structure in the forelimbs of many vertebrates is an example of:
1. Convergent evolution
2. Analogy
3. Homology
4. Adaptive radiation
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Sickle cell anaemia has not been eliminated from African population as
1. It is controlled by dominant genes
2. It is controlled by recessive genes
3. It is not a fatal disease
4. It provides immunity against malaria
In the famous experiment by Louis Pasteur, the straight and long-necked flasks served :
1. as the experimental setup
2. as a control
3. as a cohort
4. no useful purpose
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In the human population the frequency of which of the following will always be more than what is apparent?
| 1. | somatic mutations | 2. | dominant alleles |
| 3. | recessive alleles | 4. | females |
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The lineage of the modern horse can be traced back in time to:
| 1. | Hyracotherium | 2. | Equus |
| 3. | Mesohippus | 4. | Merychippus |
In genetic drift, the term “genetic bottleneck” means:
1. reduction in allele frequencies or richness
2. random change in allele frequency by chance alone
3. sudden increase in the number of individuals
4. reproductive isolation of the population
In Britain, with the passage of clean air legislation, the frequency of melanic forms of the peppered moth decreased dramatically. This is called :
| 1. | saltatory evolution | 2. | retrograde evolution |
| 3. | reverse evolution | 4. | Antievolution |
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