EVOLUTION
EVOLUTION OF A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It can decrease genetic diversity in a population
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It is necessary in order for a population to be in equilibrium
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It can increase genetic diversity in a population
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It plays a much larger role in determining the genetic makeup of populations than natural selection
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Detailed explanation-1: -Genetic drift cannot create new alleles, so it cannot increase genetic diversity (the number of alleles in a population). It can, however, decrease genetic diversity if an allele of a low frequency is not passed down to subsequent generations due to pure chance.
Detailed explanation-2: -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-3: -So, the correct answer is ‘It upsets the Hardy Weinberg Equilibrium’.
Detailed explanation-4: -The 10:0 situation illustrates one of the most important effects of genetic drift: it reduces the amount of genetic variation in a population. And with less genetic variation, there is less for natural selection to work with.
Detailed explanation-5: -Populations, Species, and Conservation Genetics Genetic drift involves the loss of alleles from a population by chance. Random fluctuations in allele frequencies in small populations reduce genetic variation, leading to increased homozygosity and loss of evolutionary adaptability to change.