Short Answer TypeWho was the originator of the theory of Natural Selection ? Explain the evolution of species by this theory.
Write the causative agent and the most important symptom of each of the following diseases :
(i) Whooping cough
(ii) Tuberculosis
(iii) Measles
(iv) Malaria
Differentiate between :
(i) Spontaneous and Induced Mutation.
(ii) Geographical and Reproductive Isolation.
(i)
| Spontaneous mutation | Induced mutation |
| Spontaneous mutations arise under natural environment. These are caused either due to intracellular factors or due to background cosmic radiations. | These are introduced artificially or experimentally. Any physical or chemical agent which introduces mutation is called a mutagen. |
| Geographical isolation | Reproductive isolation |
| Geographic isolation is a term that refers to a population of animals, plants, or other organisms that are separated from exchanging genetic material with other organisms of the same species. | Reproductive isolation refers to the situation where different species may live in the same area, but properties of individuals prevent them from interbreeding. The things which stop species or groups of organisms reproducing sexually are called isolating mechanisms. |
Long Answer Type
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