Q. No.Genetic drift is :
1.
random changes in gene frequency in a population
2.
generational fluctuations in gene frequencies that produce no effect
3.
changes due to interbreeding with other species populations
4.
the effect of mutations as they spread through neighbouring populations
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Which one of the following would cause the Hardy-Weinberg principle to be inaccurate?
| 1. | The size of the population is very large. |
| 2. | Individuals mate with one another at random. |
| 3. | Natural selection is present. |
| 4. | There is no source of new copies of alleles from outside the population. |
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The theory of spontaneous generation stated that:
| 1. | life arose from living forms only |
| 2. | life can arise from both living and non-living |
| 3. | life can arise from non-living things only |
| 4. | life arises spontaneously, neither from the living nor from the non-living |
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Palaeontological evidence for evolution refers to the:
| 1. | development of the embryo | 2. | homologous organs |
| 3. | fossils | 4. | analogous organs |
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Analogous organs arise due to:
| 1. | divergent evolution | 2. | artificial selection |
| 3. | genetic drift | 4. | convergent evolution |
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1. Sedimentary rocks
2. Igneous rocks
3. Metamorphic rocks
4. Any type of rock
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For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group-bearing organisms is likely to be:
| 1. | 42% | 2. | 49% |
| 3. | 9% | 4. | 58% |
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Which type of selection explains industrial melanism observed in moth, Biston betularia?
| 1. | Stabilising | 2. | Directional |
| 3. | Disruptive | 4. | Artificial |
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In 1953, S. L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for the origin of the first form of life from pre-existing non-living organic molecules. The primitive earth conditions created include:
| 1. | low temperature, volcanic storms, an atmosphere rich in oxygen |
| 2. | low temperature, volcanic storms, reducing atmosphere |
| 3. | high temperature, volcanic storms, non-reducing atmosphere |
| 4. | high temperature, volcanic storms, reducing atmosphere containing CH4, NH3 etc. |
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Gene flow is :
| 1. | the emergence of new species from pre-existing species |
| 2. | the exchange of genes during fertilization |
| 3. | mating between close relatives |
| 4. | the movement of genes between species populations |
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