Selection: The Mechanism of Evolution (2nd Edition)

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Selection: The Mechanism of Evolution by Graham Bell

More filters. Sort order. Laura Barrier rated it it was amazing Apr 01, Migla rated it really liked it Aug 22, Jeremy Gray rated it it was amazing Jul 01, Matthew marked it as to-read Jun 10, James added it May 25, Amanda marked it as to-read Oct 23, Zachary added it Feb 26, Olenka marked it as to-read Apr 21, Davor Nikolic marked it as to-read Sep 22, Oana Caraman marked it as to-read Nov 15, Alvin added it Nov 22, Tanya P marked it as to-read Apr 13, Michowel marked it as to-read Sep 18, Yang Yang marked it as to-read Jan 04, Vincent marked it as to-read Jan 22, J marked it as to-read Sep 16, Chitrang Dani marked it as to-read Feb 16, A population is an interbreeding group of individuals of one species in a given geographic area at the same time.

A population evolves because the population contains the collection of genes called the gene pool. As changes in the gene pool occur, a population evolves.

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  • Selection: The Mechanism of Evolution by Graham Bell.

It is a change in the nature of the DNA in one or more chromosomes. Mutations give rise to new alleles; therefore, they are a source of genetic variation in a population. Mutations may be harmful or benign, but they may also be beneficial.


For example, a mutation may permit organisms in a population to produce enzymes that will allow them to use certain food materials. Therefore, natural selection tends to remove the less-fit individuals, allowing more-fit individuals to survive and form a population. Another mechanism of evolution may occur during the migration of individuals from one group or location to another.

When the migrating individuals interbreed with the new population, they contribute their genes to the gene pool of the local population.

Population Genetics

This establishes gene flow in the population. Gene flow occurs, for example, when wind carries seeds far beyond the bounds of the parent plant population.

As another example, animals may be driven off from a herd. This forces them to migrate to a new population, thereby bringing new genes to a gene pool. Gene flow tends to increase the similarity between remaining populations of the same species because it makes gene pools more similar to one another. Another mechanism for evolution is genetic drift, which can occur when a small group of individuals leaves a population and establishes a new one in a geographically isolated region.

For example, when a small population of fish is placed in a lake, the fish population will evolve into one that is different from the original.

Conservation and the Genetics of Populations, 2nd Edition

Guest Box 4: Louis Bernatchez, Rapid evolutionary changes of gene expression in domesticated Atlantic salmon and its consequences for the conservation of wild populations, Guest Box 6: Menna E. Jones, Reduced genetic variation and the emergence of an extinction-threatening disease in the Tasmanian devil, Guest Box 7: Craig R.

Miller and Lisette P. Waits, Estimation of effective population size in Yellowstone grizzly bears, Guest Box 8: Paul A. Hohenlohe and William A. Cresko, Natural selection across the genome of the threespine stickleback fish, Guest Box 9: M. Schwartz and J.

Population genetics

Tucker, Genetic population structure and conservation of fisher in western North America, Guest Box Robin S. Waples, Estimation of effective population size using gametic disequilibrium, Guest Box A. Young, M. Pickup, and B.

2nd Edition

Murray, Management implications of loss of genetic diversity at the selfincompatibility locus for the button wrinklewort, Guest Box Robert C. Vrijenhoek, Fitness loss and genetic rescue in stream-dwelling topminnows, Guest Box David J.

Coates, Identifying units of conservation in a rich and fragmented flora, Lacy, Understanding inbreeding depression: 25 years of experiments with Peromyscus mice, Guest Box S. Franks, Rapid evolution of flowering time by an annual plant in response to climate fluctuation,