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CBSE Class 10 Answered

Selection of variants by environmental factors forms the basis for evolutionary processes.explain the statement with example.

Asked by Tejasvikumar12438 | 07 Mar, 2019, 09:00: PM
Expert Answer
  • Variations produced in the organisms get accumulated and are passed on from the parents to their offspring by the phenomenon of inheritance.
  • The significance of a variation shows up only if it continues to be inherited by the offspring of several generations.
  • All variations that occur in a species do not have an equal chance of surviving in the environment. Depending on the nature of variations, different individuals would have different kinds of advantages.
  • Selection of variants by the environmental factors forms the basis of evolutionary processes.
  • Useful variations stand a chance of survival because nature selects only the useful variations.
  • These variations may lead to increased survival advantages of the individuals due to positive adoption of traits or may merely contribute to the genetic drift.
  • For example, bacteria variants which can withstand heat have better chances to survive in a heat wave than the non-variant bacteria having no capacity to tolerate heat wave. Thus, variants in a population of a species help in the survival of a species.
  • In the absence of variation, there would be no science of heredity as all individuals of a race would be identical to one another in all aspects.
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