An isolated population of humans, with approximately equal numbers of blue-eyed and brown-eyed i...

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An isolated population of humans, with approximately equal numbers of blue-eyed and brown-eyed individuals, was decimated by an earthquake. Only a few brown-eyed people remained to form the next generation. This kind of change in the gene pool is called -
(a) Hardy-Weinberg equilibrium
(b) Block gene flow
(c) Bottleneck effect
(d) Founder effect
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