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NCERT Exemplar · Class 12 · Biology

Chapter 7: Evolution

Practice each question, then open the answer or worked solution.

Short Answer Questions

12 questions
Q11Written answer

Enumerate the three most characteristic criteria for designating a Mendelian population.

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Worked solution

Ans: The three most important criteria for the mendelian population :

  1. The population must be sufficiently large

  2. The population must have potentialities for the free flow of genetic material among individuals.

  3. Migration should be nil or negligible in the population.


Q12Written answer

"Migration may enhance or blur the effects of selection”. Comment.

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Worked solution

Ans: Migration can enhance the natural selection process by bringing in alleles and traits within the population. And it can blur the effect of selection by removing the useful traits and genes from the population.