Q. No.Which is the most common mechanism of genetic variation in the population of a sexually-reproducing organism?
1.
Recombination
2.
Transduction
3.
Chromosomal aberrations
4.
Genetic drift
The idea of mutations was brought forth by
| 1. | Hugo de Vries, who worked on evening primrose |
| 2. | Gregor Mendel, who worked on Pisum sativum |
| 3. | Hardy Weinberg, who worked on allele frequencies in a population |
| 4. | Charles Darwin, who observed a wide variety of organisms during sea voyage |
Stanley Miller had put the Oparin-Haldane theory to test in 1953 by creating in the laboratory, the probable conditions on the primitive earth. In the experiment, simple amino acids were synthesized from which of the following mixtures, as observed after eighteen days?
1.
2.
3.
4.
Animal husbandry and plant breeding programmes are the examples of:
| 1. | reverse evolution | 2. | artificial selection |
| 3. | mutation | 4. | natural selection |
Evolution of life shows that life forms had a trend of moving from:
| 1. | land to water |
| 2. | dryland to wet land |
| 3. | fresh water to sea water |
| 4. | water to land |
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% |
Which one of the following correctly describes the homologous structures?
| 1. | Organs with anatomical similarities, but performing different functions. |
| 2. | Organs with anatomical dissimilarities, but performing same functions. |
| 3. | Organs that have no functions now, but had an important function in ancestors. |
| 4. | Organs appearing only in embryonic stage and disappearing later in the adult. |
Which one of the following phenomena supports Darwin’s concept of natural selection in organic evolution?
| 1. | Production of Dolly, the sheep by cloning. |
| 2. | Development of organs from stem cells for organ transplantation. |
| 3. | Development of transgenic animals. |
| 4. | Prevalence of pesticide resistant insects. |
When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed
1. Convergent evolution
2. Divergent evolution
3. Microevolution
4. Co-evolution
Analogous structures are result of
1. Divergent evolution
2. Convergent evolution
3. Shared evolution
4. Stabilizing selection
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