Genetic drift can be caused by a variety of events. A genetic bottleneck, which is one such event, results when a population loses most of its members. Genetic drift due to the founder effect results when a small group is permanently isolated from a larger population. Populations resulting from either a genetic bottleneck or the founder effect tend to have fewer allele variations than the original population. The effects of genetic drift last for many generations.
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Effects of Genetic Drift Genetic drift is the change in allele relative frequencies from generation to generation as a result of chance events, such as hurricanes, disease, and over-hunting. Over time, genetic drift tends to reduce genetic variation in populations through losses of alleles from the gene pool. Two situations that can increase the likelihood of genetic drift are the bottleneck effect and the founder effect. A disaster caused by a sudden change in the environment may drastically reduce the size of a population, affecting the few survivors who have passed through a restrictive "bottleneck." Their gene pool may not be representative of the original population's gene pool. The founder effect occurs when a few individuals become isolated from a larger population and establish a new population. Again, their gene pool may not be representative of the original population's gene pool. Question 9: Name two events that can lead to the bottleneck effect in natural populations.
Sri K.
The bottle neck effect occurs when A few individuals start a new population in an area that is separate from their original population The environment selects a small number of individuals in a population A few individuals in a population are randomly selected for by an event Allele frequencies of a population remain constant over time Allele frequencies shift leading to an adaptation Small populations are more susceptible to the effects of genetic drift. True False Genetic drift selects for specific alleles in a population. True False Which of the following is an example of the founder effect? A forest fire kills a large number of squirrels and the remaining few squirrels survive and reproduce. A hurricane blows a few lizards to an island in the Caribbean that previously did not have these types of lizards on them. Petunia rode her bicycle over a population of insects on the sidewalk and killed some of them. The population of Cheetahs in South Africa
Jorge V.
What do the founder effect and the bottleneck effect have in common? Both the founder effect and the bottleneck effect result from mutation Both the founder effect and the bottleneck effect result from increased gene flow Both the founder effect and the bottleneck effect maintain Hardy-Weinberg equilibrium Both the founder effect and the bottleneck effect occur by chance None of the above statements is correct
Adi S.
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