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CBSE Class 10 Answered

what is speciation? explain all the factors that affect the process of speciation. (5 marks)
Asked by niharika | 21 Jan, 2016, 18:59: PM
answered-by-expert Expert Answer

Hi,

The process by which a new species develops from the existing species is known as speciation.

Factors that affect the process of speciation are:

Geographical isolation –

  • Caused by various types of barriers such as mountain ranges, rivers and seas.
  • Leads to reproductive isolation due to which there is no flow of genes between separated groups of population.

Genetic drift –

  • Caused by drastic changes in the frequencies of particular genes by chance alone
  • Genetic drift with changes in the gene flow imposed by the isolation mechanism acts as an agent of speciation

Natural selection –

  • Process of selection of characteristics which contributes to the fitness of survival of organisms
  • Genetic variation within a population of organisms may cause some individuals to survive and reproduce more successfully than other
Answered by | 21 Jan, 2016, 19:06: PM
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