Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days


Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number


Mon to Sat - 11 AM to 8 PM

CBSE - X - Biology - Heredity and Evolution

Selection of variants by the environmental factors forms the basis of the evolutionary process. explain.

Asked by somyap 8th February 2011, 12:00 AM
Answered by Expert


Dear student,
Natural selection is exerted on mixed populations composed of organisms with the parental genetic makeup and of derivatives thereof carrying different genetic variations.
Each of these variants will have its own characteristic ability to deal with the encountered living conditions, so that in a growing population, the fittest organisms will finally take over, while others may eventually become eliminated. Natural selection is exerted on expressed functions. Natural selection, together with the variant phenotypes that are available in mixed populations, determine the directions taken by the evolution of the organisms in question.
So the direction and process of evolution is determined depending on which factors are selected at a particular point of time by nature.
Regards, Team Topperlearning
Answered by Expert 11th February 2011, 11:57 PM

Rate this answer

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Report an issue
Your answer has been posted successfully!

Latest Questions

CBSE X Biology Life Processes

Asked by rayalu12345 24th March 2018, 7:12 PM

CBSE XII Science Biology Strategies for Enhancement in Food Production

Asked by pksunilnair 24th March 2018, 5:43 PM

CBSE XII Science Biology Sexual Reproduction in Flowering Plants

Asked by pksunilnair 24th March 2018, 5:29 PM