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Genetic DriftRandom Genetic Drift from the Talk.Origins archive. Population Bottleneck: A type of genetic drift occurring when many members of a population die, and a few remaining individuals mate, eventually restoring their numbers. The new population has lost much of the genetic diversity that was present in the larger ancestral population. Figure 15.3, The Bottleneck Effect, and further information on the cheetah. Another illustrated example of a bottleneck The Greater Prairie Chicken and the Illinois Prairie Chicken's Last Waltz Florida Panther breeding w/Mountain Lions from Texas from Geocities.com New Hope for the Florida Panther (from the Endangered Species Bulletin, Vol. XXI No. 2)
Founder Effect: A type of genetic drift resulting in the establishment of a new, geographically isolated population from a single or very few individuals. It is very unlikely that the gene pool of a founding population is representative of the original population. Figure 15.2a, The Founder Effect Ellis-van Creveld Syndrome. Small groups of people founding new settlements may have different allele frequencies than the original population, and may also have higher incidents of certain traits (such as genetic disorders) because they marry within the group. Ellis-van Creveld is an autosomal recessive disease and occurs in 7% of the people in the Amish community of Lancaster County, Pennsylvania. The occurrence of the disease is high because these Amish marry among themselves. See page 291, text, for more information.
Founder Effect: A type of genetic drift resulting in the establishment of a new, geographically isolated population from a single or very few individuals. It is very unlikely that the gene pool of a founding population is representative of the original population. Figure 15.2a, The Founder Effect Ellis-van Creveld Syndrome. Small groups of people founding new settlements may have different allele frequencies than the original population, and may also have higher incidents of certain traits (such as genetic disorders) because they marry within the group. Ellis-van Creveld is an autosomal recessive disease and occurs in 7% of the people in the Amish community of Lancaster County, Pennsylvania. The occurrence of the disease is high because these Amish marry among themselves. See page 291, text, for more information. | ||