Advertisements
Advertisements
प्रश्न
Name and define the three types of natural selection.
उत्तर
Three types of natural selection are :
1) Directional selection: It produces a regular change in a gene pool of a population in one direction in respect to one or some specific characteristics. It is a progressive selection.
2) Stabilising selection: This type of selection favours average or normal phenotypes and eliminates extreme variants. It occurs in a constant or unchanging environment and eliminates new mutations. It favours homozygosity.
3) Disruptive or diversifying selection: This type of selection acts to break up a previously homogenous population into several different adaptive norms. It favours individuals at both extremes of a distribution curve.
APPEARS IN
संबंधित प्रश्न
What is "fitness of an individual" according to Darwin?
Write short notes based upon the information known to you.
Darwin’s theory of natural selection
The theory of Natural Selection was proposed by
What are objections raised against Darwin's theory?
The more characteristics two species have in common ______
Match List - I with List - II.
| List - I | List II | ||
| (a) | Adaptive radiation | (i) | Selection of resistant varieties due to excessive use of herbicides and pesticides |
| (b) | Convergent evolution | (ii) | Bones of forelimbs in Man and Whale |
| (c) | Divergent evolution | (iii) | Wings of Butterfly and Bird |
| (d) | Evolution by anthropo- genic action | (iv) | Darwin Finches |
Choose the correct answer from the options given below.
Mention Darwin's observations made on finches during his visit of Galapagos Islands. Write the explanation given by Darwin on his observations.
Which one of the following was not explained by Darwinism?
The scientist who is regarded as the "Father of Evolution" is ______.
Differentiate between Lamarck's Theory and Darwin's Theory.
