A) population
B) mutation
C) isolation
D) All of these
Correct Answer: D
Solution :
Modem theory of organic evolution is based on five agents of evolutionary changes. These are as follows [a] Mutation-It is a sudden and heritable change in an organism, which is generally due to change in the base sequence of the nucleic acid in the genome of organism. It is the ultimately source of variations. [b] Gene flow-It is the movement of alleles from one population to another. It can be a powerful agent of change. [c] Non-random mating-In this inbreeding is the most common form. It does not alter allele frequency but decreases the proportion of heterozygous. [d] Genetic drift-Statistical accidents and usually occurs only in very small populations. [e] Selection-The only form that produces adaptive evolutionary changes.
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