We watched "The Soul of Night," in which a narrator shepherded us through the constellations and the Milky Way, and across the North American skies as they might have appeared through the eons, accompanied by a heavenly soundtrack of works by Wagner and others.
In the same collection, the author of Epidemics describes the case of a man whose epilepsy is cured as quickly as it had appeared, through complete abstinence of food and drink.
The allele could have reached fixation in the human population due to genetic drift, or it might have appeared through recent positive selection.
The major conclusion is that the polyploids of D. alata would have appeared through the formation of unreduced gametes.
Similarly, the phylogenetic tree of zebrafish repeats is consistent with repeats 12-15 happearedpeared through individual single exon duplication events.
The tetraploids would have appeared through bilateral sexual polyploidization via the union of two unreduced gametes due to the sterility of triploids.
These GluRS sequences appear in the non-proteobacterial cluster, as sister clades of chlamydiae, fusobacteria and deinococcous-thermus. Unlike the canonical proteobacterial GluRS (the grey shaded region of Figure 2), GluRS belonging to the γ*-/α*-group seem to have appeared through some alternate evolutionary route, probably via HGT, as has been noted earlier [ 22].
The reason is that, unlike other interpretations [ 10, 24, 25, 26], we understand that all nodes in a phylogenetic network represent species: each tree node represents a species produced by mutations from its immediate ancestor, while reticulations represent species that have appeared through "reticulate" events involving the interaction of more than one species.
Importantly, it also implies that genetic variation that has appeared neutral through the lens of traditional theory can actually experience selection on interactions and thus has a much greater adaptive potential than previously considered.
