balancing selection


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balancing selection

any selective process which maintains a balanced POLYMORPHISM.
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However, the concept of a porous genome suggests differential rates of introgression across the genome as a result of different selective pressures; loci under balancing selection are likely to show high rates of introgression, while loci under divergent selection will resist introgression.
When we looked for genetic clues pointing to other, more ancient, examples of balancing selection, we found strong evidence for at least six such regions and weaker evidence for another 119-many more than we expected," said study author Molly Przeworski, PhD, professor of human genetics and of ecology and evolution at the University of Chicago.
Mix-match favoritism, called balancing selection, also shows up in sickle-cell anemia.
104, there is no mention of the window of enhanced silent-site variability around the location of the allozyme polymorphism, discovered by Kreitman and Aguade, which provides compelling evidence for balancing selection.
With its expanded produce and meat departments, Food Lion finds itself delicately balancing selection with convenience.
The net result of this balancing selection would be an optimal ovipositor length in a given environment.
The initial plan will be to determine the effect of balancing selection on the evolution of recombination and outcrossing rates.
This implies that malaria earlier on wasn't a sufficiently serious cause of mortality to maintain the mutation through balancing selection.
One explanation is that balancing selection is acting on the allozyme loci, whereas mtDNA haplotypes at the same time are selectively neutral and frequencies change through drift.
Under the neutral scheme, adaptive mutations (whether subject to balancing selection or positive selection for fixation) are vanishingly rare, and the vast majority of molecular differences among species results from the chance fixation of neutral variants.
For the TIM model, B = 1, and there is no balancing selection.

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