Answer:
The movement of individuals from one place
to another is called migration. It can be the movement of individuals to a
different populations (i.e., emigration) or movement of individual into a
particular population (i.e., emigration) Migration may bring in more such alleles,
that bestow upon the individuals, such adaptations or traits which are selected
by nature. Thus enhancing 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 blur.' the effects of selection.'
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