Q. No.What is true about the isolated small tribal populations?
1.
There is no change in population size as they have a large gene pool.
2.
There is a decline in population as boys marry girls only from their own tribe.
3.
Hereditary diseases like color blindness do not spread in the isolated population.
4.
Wrestlers who develop strong body muscles in their lifetime pass this character on to their progeny.
| Convergent evolution | Divergent evolution | |
| 1. | Bones of forelimbs of vertebrates | Wings of butterflies and birds |
| 2. | Thorn of Bougainvillea and tendrils of Cucurbita | Eye of Octopus and mammals |
| 3. | Eye of Octopus and mammals | Bones of forelimbs of vertebrates |
| 4. | Thorns of Bougainvillea and tendrils of Cucurbita | Wings of butterflies and birds |
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The idea of mutation was brought forth by:
| 1. | Hardy Weinberg, who worked on allele frequencies in a population. |
| 2. | Charles Darwin, who observed a wide variety of organisms during the sea voyage. |
| 3. | Hugo do Vries, who worked on evening primrose. |
| 4. | Gregor Mendel, who worked on PisumSativum. |
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The process by which organisms with different evolutionary histories evolve similar phenotypic adaptations in response to a common environmental challenge is called:
| 1. | Natural selection | 2. | Convergent evolution |
| 3. | Non-random evolution | 4. | Adaptive radiation |
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The wings of a bird and the wings of an insect are:
| 1. | Homologous structures that represent convergent evolution. |
| 2. | Homologous structures that represent divergent evolution. |
| 3. | Analogous structures that represent convergent evolution. |
| 4. | Phylogenetic structures that represent divergent evolution. |
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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 |
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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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
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