Q12 of 52 Page 49

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

Migration is movement of individuals from one place to another.

When movement of alleles takes place, gene frequencies change in the original as well as in the new population. New genes/alleles are added to the new population and these are lost from the old population. This will lead to a gene flow if this migration happens multiple times.


Immigration brings in those alleles which confer the traits that are not selected by nature. And emigration may lead to removal of alleles that confer better adaptations.


Hence "Migration may enhance or blur the effects of selection".


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When we say "survival of the fittest", does it mean that a. those which are fit only survive, or b. those that survive are called fit? Comment.

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Enumerate three most characteristic criteria for designating a Mendelian population.

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Name the law that states that the sum of allelic frequencies in a population remains constant. What are the five factors that influence these values?

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