What is the source of new alleles?

Environmental change

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Genetic drift

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Mutation

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Natural selection

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Solution

The correct option is A Mutation
Genetic variation leads to the changes in the allelic frequencies of the genome and also results in the new alleles formation. The source of genetic variation is mutation. It is the ultimate reason for the evolution due to genetic variation. Mutation in gene result in the new allele formation which is then later passed on over generations.
Thus, the correct answer is 'mutation.'

Suggest Corrections

Column I	Column II
A. Mutation allele	(i) drastic change in population's frequencies
B. Gene flow	(ii) Differences in survival and reproduction among variant individuals.
C. Natural selection	(iii) Immigration, emigration change allele frequencies
D. Genetic drift	(iv) Source of new alleles