"Those who are better fit in an environment, leave more progeny than others." The evolutionary mechanism that operates for such a change is
1. Natural selection
2. Genetic drift
3. Reproductive isolation
4. Polyploidy
In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of:
1. | natural selection, whereby the darker forms were selected |
2. | appearance of the darker coloured individuals due to very poor sunlight |
3. | protective mimicry |
4. | inheritance of darker colour character acquired due to the darker environment |
A type of natural selection in which more individuals acquire peripheral character value at both ends of distribution curve is
1. Directional selection
2. Disruptive selection
3. Balancing selection
4. Stabilising selection
If more individuals acquire peripheral character value at both the ends of the distribution curve; in such case natural selection has resulted in
(1) Stabilization
(2) Directional
(3) Disruption
(4) May be B or C depending upon population parameters
Which one of the following populations would most quickly lead to two groups with few shared traits?
1. a population with disruptive selection
2. a population with directional selection
3. a population with stabilizing selection
4. a population with no selection
A location with luxuriant growth of lichens on the trees indicates that the:-
1. trees are very healthy
2. trees are heavily infested
3. location is highly polluted
4. location is not polluted
Natural selection is best defined as occurring when the environment causes :
1. differential success in reproduction
2. differential mortality
3. assortative mating
4. a reduced gene pool
Directional selection favours:
(1) Both extremes of a trait
(2) Intermediate form of a trait
(3) Environmental differences
(4) One extreme form over the other extreme form and over intermediate forms of the trait
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 |
............... operates to eliminate intermediate phenotypes.
(1) Directional selection
(2) Disruptive selection
(3) Stabilizing selection
(4) Random chance