Analysis of the simulation results show that a selective sweep results in a reduction of variation linked to the target of selection, and the extent of such reduction is dependent on the selection coefficient (s) (Figure 3).
Instead, the target of selection is an optimum distribution of mutation rates, a 'mutational quasispecies'.
It may be hypothesised that reduced fearfulness has been a major target of selection during domestication.
Two other studies of Tibetans' adaptation to high altitude have also identified this gene as a target of selection.
First, as we noted above, we have confirmed that gtsB is a target of selection on glucose and that the synonymous mutations do not confer general fitness advantages to life in a laboratory environment.
Taken together, these results strongly suggest that gtsB is a target of selection, that the synonymous mutations confer an adaptive advantage specifically on glucose and that the fitness gains do not stem from a loss of gene function.
But each of the regions is about 200,000 DNA units in length and contains many genes, so the researchers do not yet know which of these genes was the target of selection, Dr. Orlando said.
We have shown that the synonymous mutations identified in this study occur in a gene that is a target of selection, confer large fitness benefits typical of other non-synonymous mutations involved in adaptation to resource-limited environments, increase fitness via increased gene expression and are found in closely related species in nature.
For them, a reproducer is the "target of selection".
Therefore evolvability is not a direct target of selection.
Thus, we found no evidence in our population to support song sharing as a target of selection in the evolution of song repertoires.
