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The results were anticipated to identify which of the natural HpSVd variants was the origin for hop stunt epidemics in Japan, and to shed light on the molecular process by which viroid fix mutations when adapting to new host species.
Although the latter protocol is commonly used for mutagenicity testing in somatic tissues, it has several shortcomings for germ cell testing because it provides limited exposure of the proliferating phase of spermatogenesis when mutations are fixed in the transgene.
However, other mutations had no significant effect on the growth rate, and even when all fixed mutations in strain F were introduced into the parent genome, the observed growth rate of the mutated strain was significantly smaller than that of strain F under the ethanol stress condition.
With a small population size, natural selection is inefficient, and mildly deleterious mutations can be fixed even when they would not occur in a large population.
Although mutations of fixed genes sometimes occur, when they do they are often either lethal or associated with disease or disability.
Drift probably operates at the same rate in frozen, elastic and plastic species, however, the genetic draft operates more effectively during plastic phase of evolution when many neutral and nearly neutral mutations are being fixed with positive mutations by genetic hitchhiking.
Despite such mutation, the number of total mutations fixed in the consensus sequence of population RAp35 was very high (1.13 mutations/passage, Figure 6) when compared with its ancestor (0.2 mutation/passage).
The rate at which substitutions occur in a population is found by multiplying the number of mutations produced per generation with the probability that these mutations are fixed.
Thus, beneficial mutations became fixed in phage populations prior to new mutations arising.
