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The evolution of populations due to chance is

A). genetic variation.
B). natural selection.
C). has more effect in large populations than in small populations.
D). genetic drift.
E). gene flow.

Answer :

Answer:

D). genetic drift

Explanation:

Genetic drift is the change in an allele frequency over a period of time. This event has to be random and a chance event.

For example: In a population of a flowering plant there are two types of flowers, blue and yellow. Due to a fire many yellow flowers are destroyed by chance. Now the resultant population will have more blue flowers and when they reproduce the population will eventually evolve to have more blue flowers. Effect of genetic variation is more pronounced in a small population since its easy to disturb the allele frequency.

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