Showing papers on "Fluctuating asymmetry published in 1988"
TL;DR: Changes in fluctuating asymmetry reflect changes in fitness, as in the case of the fitness modifier, its effect to be dominant and data consistent with the fitness/asymmetry modifier being the same gene (gene complex).
Abstract: Genetic evidence suggests that the evolution of resistance to the insecticide diazinon in Lucilia cuprina initially produced an increase in asymmetry. At that time resistant flies were presumed to be at a selective disadvantage in the absence of diazinon. Subsequent evolution in natural populations selected modifiers to ameliorate these effects. The fitness and fluctuating asymmetry levels of resistant flies are currently similar to those of susceptibles. Previous genetic analyses have shown the fitness modifier to co-segregate with the region of chromosome III marked by the white eyes, w, locus, unlinked to the diazinon resistance locus, Rop-1, on chromosome IV. This study maps the asymmetry modifier to the same region, shows, as in the case of the fitness modifier, its effect to be dominant and presents data consistent with the fitness/asymmetry modifier being the same gene (gene complex). These results suggest changes in fluctuating asymmetry reflect changes in fitness.
188 citations
TL;DR: A significant inverse correlation with gestational age and with the health status of the infants and their mothers, as well as a positive correlation with the mothers' mean FA values were documented.
Abstract: Fluctuating asymmetry (FA) of 8 morphometric traits was studied in 113 preterm infants (26-36 wk of gestation), 103 term infants (37-41 wk), and their respective parents. With 3 different measures of FA, the highest values were obtained from extremely preterm infants (26-29 wk), and the lowest from the group of term infants. The estimates of FA values among parents, particularly mothers, showed a similar, albeit less pronounced, trend. Multiple regression analysis of individual mean FA values, calculated in infants for the 8 studied bilateral traits, documented a significant inverse correlation with gestational age and with the health status of the infants and their mothers, as well as a positive correlation with the mothers' mean FA values.
97 citations
TL;DR: Effects of differing salinities on morphological characters have been found in marine and brackish populations of Tisbe holothuriae and suggested an active role of salinity as a factor promoting divergence, in order to test if the observed differentiation could be due to the level of heterozygosity.
Abstract: Effects of differing salinities on morphological characters have been found in marine and brackish populations of Tisbe holothuriae The results suggested an active role of salinity as a factor promoting divergence In order to test if the observed differentiation could be due to the level of heterozygosity, a study was performed in strains with low and high homozygosity Six quantitative traits, and their respective fluctuating asymmetry, have been measured in outbred (coefficient of consanguineity, F = 0) and inbred (F = 05) strains, raised at three salinities; 20, 25 and 35‰ The analysis of variance was applied to test if the morphological measures were the same, and if the variations induced by decreased salinity had the same trend, in the two strains Wilcoxon test was applied to the asymmetry, when it was not possible to render the variances homogeneous The results showed that the measures and the effects of salinity on morphometry differed in the strains with low and high homozygosity No effect of salinity on asymmetry was found Length measures showed higher asymmetry in the most homozygous strain
4 citations