. What is meant by speciation? List four factors that could lead to speciation


Which of  these cannot be a major factor in the speciation of a self-pollinating plant species. Give reason to justify your answer.                                                                             

 

Best Answer

Ans.  Speciation.  The  process  by  which  new  species  develop  from  the  existing  species  by evolution  or any genetic modification  of previous  species is known  as speciation.

The important factors which could lead to the formation of new species are:

(i) Geographical isolation of a population caused by various types of barriers like mountain ranges, rivers, sea etc. The geographical  isolation leads to reproductive isolation due  to  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 due to natural selection.

(iv)  Drastic change in the genes or DNA called mutation is also a cause of speciation. Reproductive isolation cannot be a major factor for the speciation of a self-pollinating plant species as it does not depend on any other  plant for its reproduction process.

 

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