A population of blue and red beetle living in a bush were accidentally stamped by an elephant. This killed majority of red beetles and the population of blue beetles was increased. This is due to ____.

genetic drift

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natural selection

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phylogenetic variation

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artificial selection

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Solution

The correct option is A genetic drift
Sudden change in any population is known as genetic drift or Sewall Wright effect. It is a variation in the relative frequency of genes of a small population, owing to the chance of disappearance of particular genes due to accident or pure chance. These variations may or may not be useful for the bearer as they are not naturally selected. An elephant stamping the bush is an event which occured accidentally. This led to the change in frequency of a particular gene/ trait, in this case the blue coloured beetle.

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