More important, natural selection and other processes change gene frequencies in ways not governed by pure chance, so that no allele has an opportunity to become fixed as a consequence of genetic drift alone.
While many studies have shown that IBD exhibits a genetic component via genome-wide association studies, genetic drift alone cannot account for this increase, and other factors, such as those found in the environment must play a role, suggesting a "multiple hit" phenomenon that precipitates disease.
Many brown dwarfs drift alone through space, just like stars, but some dwarfs exist in binary pairs.
The radial motion of the particles becomes much slower than the P-R drift alone, resulting in a pile-up of the particles.
Using gene duplication to explain variational patterns by the action of mutation and drift alone, instead of also invoking selection, is tempting.
In his response (Wright 1948), Wright pointed out, first, that his theory of evolution explicitly involved the simultaneous action of several forces (selection, drift, mutation, and migration) and he emphatically rejected the paradigm of Fisher and Ford that either selection or drift alone had to be responsible for all of the observed fluctuation in gene frequencies.
We drift alone, unobserved, unknown, watching ship after oblivious ship glide past on the horizon.
Genetic drift alone cannot explain the observed polymorphism, suggesting that other evolutionary mechanisms are operating.
The ISG15 variability largely exceeds what can be expected by genetic drift alone [2].
This suggests that the degree of differentiation in quantitative traits exceeds the differentiation by genetic drift alone.
Reynolds' distance [53] assumes that there is no mutation, so that gene frequency changes are by genetic drift alone.
