A) induced mutation
B) natural selection
C) reproductive isolation
D) geographical isolation
Correct Answer: B
Solution :
Industrial melanism in the peppered moth (Biston betularia) provides a well studied example of directional selection (natural selection) from nature. Directional selection produces a regular change with in a population in one direction in respect to certain characteristic. In geographical isolation two populations of the same species are separated by some physical or geographic barriers or they occupy different geographical areas. Reproductive isolation is the failure of interbreeding between closely related species.
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