Match the columns :

Column - $I$ Column - $II$
$(1)$ Mutation $(a)$ Change in population allele frequencies due to chance alone.
$(2)$ Gene flow $(b)$ Difference insurvival and reproduction
$(3)$ Natural selection $(c)$ Immigration, emigration change allele frequencies.
$(4)$  Genetic drift $(d)$ Source of new alleles.

 

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$(1 - d), (2 - c), (3 - b), (4-a)$

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