Explain the following a Speciation b Natural Selection CBSE class10 Science 2015

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Explain the following: (a) Speciation (b) Natural Selection CBSE- class10- Science 2015

CBSE- class10- Science 2015

Asked On2017-07-13 04:11:16 by:Fututron

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Answer:

(a) Speciation: The process by which new species develop from the existing species is known as speciation.

The factors which could lead to speciation are

i. Geographical isolation of population caused by various types of barriers such as mountain ranges, rivers and seas. This leads to reproductive isolation because of which there is no flow of genes between separated groups of population.

ii. Genetic drift caused by drastic changes in the frequencies of particular genes by chance alone.

iii. Variations caused in individuals because of natural selection.

(b) Natural Selection: Natural selection is the process of evolution of a species whereby characteristics which help individual organisms to survive and reproduce are passed on to their offspring, and those characteristics which do not help are not passed on.

Charles Darwin proposed the theory of natural selection. According to him, nature selects the fittest.

There are always changes in the progeny when an animal reproduces by sexual reproduction. Example: If one of the progeny of deer is tall and the other is short, then the tall one with long legs will survive. Because the progeny with short height cannot reach the leaves of tall trees and cannot get food, they will starve and hence die. Thus, it proves the theory of natural selection.

Answerd on:2017-07-13 Answerd By:Aparna-Dasgupta

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Explain the following: (a) Speciation (b) Natural Selection CBSE- class10- Science 2015

CBSE- class10- Science 2015

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