EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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founder effect
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bottleneck effect
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blocked gene flow
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Hardy-Weinberg equilibrium
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Detailed explanation-1: -So, the correct answer is ‘Bottle-neck effect’.
Detailed explanation-2: -An isolated population of humans, with approximately equal number 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. No worries!
Detailed explanation-3: -The bottleneck effect is an extreme example of genetic drift that happens when the size of a population is severely reduced. Events like natural disasters (earthquakes, floods, fires) can decimate a population, killing most individuals and leaving behind a small, random assortment of survivors.
Detailed explanation-4: -Once it begins, genetic drift will continue until the involved allele is either lost by a population or is the only allele present at a particular gene locus within a population. Both possibilities decrease the genetic diversity of a population.
Detailed explanation-5: -The random changes that occur in populations that are small are called genetic drift or the founder effect. This is a change in the population allele frequency that is caused by the random chances that a certain allele will be passed along over another.