Answer:
The movement of individuals from one place to another is called migration. It can be the movement of individuals to a different population (i.e. emigration) or movement of individuals into a particular population (i.e. immigration). Migration may bring in more such alleles, that bestow upon the individuals, such adaptations or traits which are selected by nature. This enhances the effect of selection. Similarly, emigration may lead to removal of such alleles that confer better adaptations. Immigration may also bring in those alleles which confer the traits that are not selected by nature, i.e. blurr the effects of selection. Hence, it is justifiable to say that 'migration may enhance or blurr the effects of selection'.
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