Eunice Santiago

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Genotype × temperature interactions for egg laying were studied in Drosophila melanogaster using two sets of half diallel crosses: one between inbred lines of the same geographic origin, and the other between established laboratory, newly derived inbred lines from different geographic origins. The sensitivity of most genotypes to changes in temperature was(More)
The elapsed time from the appearance of a single copy of a recessive gene in a population with separate sexes until the first detection of a recessive homozygote has been analyzed using simulation techniques. Several systems of mating frequently used in laboratory maintenance and artificial selection processes have been the subject of this study. The(More)
Five lines of Drosophila melanogaster that reached an extreme phenotype after long-term selection for increased dorsocentral bristle number, were analysed for the presence of lethals. Seven chromosome II and three chromosome III lethal types were detected in four of the lines, at frequencies ranging from between 6% and 36%. No lethal had any demonstrable(More)
Rare earth elements (REE) are either housed in exotic REE minerals that sporadically populate the host rock or they occur as ionic substitutions in the crystal structure of existing rock-forming minerals. The genesis of REEs in carbonatite rocks can result in intricate mineralogical textures between REE minerals, host rock minerals, and minerals formed by(More)
Segregation Distorter (SD) associated with the second chromosome of D. melanogaster is found in nature at equilibrium frequencies lower than 5%. We report extremely high frequencies of SD (30–50%) in two selected strains, established in 1976, and show it to be responsible for the accumulation of deleterious genes in chromosome II. Samples of chromosomes(More)
The physiological behavior of PSII measured by chlorophyll a fluorescence explains stress responses; wonders if it can differentiate plants from different populations. For this purpose, acclimated young plants of two C. pachystachya populations were cultivated from seeds. Chlorophyll-a fluorescence was measured after fertilization and [CO2]e. In the first(More)
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