Q. No.Convergent evolution is illustrated by:
1. Rat and dog
2. Bacterium and protozoan
3. Starfish and cuttlefish
4. Dogfish and whale
Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
| 1. | Overproduction, variations, constancy of population size, natural selection |
| 2. | Variations, constancy of population size, overproduction, natural selection |
| 3. | Overproduction, constancy of population size, variations, natural selection |
| 4. | Variations, natural selection, overproduction, constancy of population size |
Random genetic drift in a population probably results from:
1. Highly genetically variable individuals
2. Interbreeding within this population
3. Constant low mutation rate
4. Large population size
In recent years, DNA sequences (nucleotide sequence) of mt-DNA and Y chromosomes were considered for the study of human evolution, because:
| 1. | They are small, and therefore, easy to study |
| 2. | They are uniparental in origin and do not take part in recombination |
| 3. | Their structure is known in greater detail |
| 4. | They can be studied from the samples of fossil remains |
Industrial melanism is an example of:
| 1. | Drug resistance |
| 2. | Darkening of the skin due to smoke from industries |
| 3. | Protective resemblance with the surroundings |
| 4. | Defensive adaptation of skin against ultraviolet radiations |
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner?
| 1. | Mutations | 2. | Random drift |
| 3. | Selection | 4. | Migration |
Darwin in his 'Natural Selection Theory' did not believe in any role of which one of the following in organic evolution:
1. Parasites and predators as natural enemies
2. Survival of the fittest
3. Struggle for existence
4. Discontinuous variations
Which one of the following describes correctly the homologous structures:
| 1. | Organs with anatomical similarities, but performing different functions |
| 2. | Organs with anatomical dissimilarities but performing the same function |
| 3. | Organs that have no function now, but had an important function in ancestors |
| 4. | Organs appear only in the embryonic stage and disappear later in the adult |
Reason for diversity in living being:
1. Mutation
2. Long-term evolutionary change
3. Gradual change
4. Short-term evolutionary change
Similarities in organisms with different genotypes indicate:
1. Microevolution
2. Macroevolution
3. Convergent evolution
4. Divergent evolution
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