Significant factors were selected by the stepwise selection method and by the forced entry method.
For multiple logistic analysis, significant risk factors were selected by using the stepwise selection method and by the forced entery method.
Propelled by the forces of selection and chance, the most efficient genes survived, and evolution insured that they would thrive.
Spatial and temporal rate variation is the signature left on genomic sequences by the force of selection.
Taken together, these data demonstrate the potential for complementation to decrease short-term evolvability in one system by dampening the force of selection, but potentially increase long-term evolvability and phenotypic flexibility by maintaining high levels of diversity.
Like the rest of the particle, the sleeve has been shaped by the forces of natural selection working over long stretches of time.
So a gene like SIR2 that linked greater longevity to lower calorie intake would be highly favored by the forces of natural selection.
But there is likely to be a single major genetic pathway, he said, in the form of a mechanism to slow aging in response to food scarcity, because any such mechanism would be heavily favored by the forces of natural selection.
As a comparison, the level of variability in transferrin, a gene suggested to have been affected by the forces of diversifying selection in salmonid fishes, was also assessed (locus sTf, Additional files 1 and 2).
By-the-glass selections are $5 to $8.
Genomes are shaped by mutation -- random changes in the chemical units of DNA caused by radiation or copying errors -- or by the force Darwin called natural selection, preserving the fittest organisms and discarding the rest.
