Multi-interval mapping of correlated trait complexes

Article Abstract:

Multi-interval mapping of correlated trait complexes is discussed using the North American Barley Genome Mapping Project as an example. Information about using Monte Carlo simulations and demonstrating thereby advantages of multitrait analysis in detection of linked quantitative trait loci (QTL) effects in the framework of mixture models is given. Despite more parameters estimated vs single-trait formulation, the method proposed allows for detection power improvement and estimation precision of linked QTLs in adjacent or nonadjacent intervals, coupling and repulsion effects included.

United States, Usage, Mathematical models, Chromosome mapping, Heredity, Probabilities, Probability theory, Monte Carlo method, Monte Carlo methods, Quantitative genetics, Correlation (Statistics)

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A complex adaptive syndrome in Drosophila caused by mircroclimatic contrasts

Article Abstract:

A complex adaptive syndrome in Drosophila melanogaster caused by mircroclimatic contrasts is discussed. The multiple adaptive differences are between isofemale lines derived from opposite slopes of a canyon in Israel. Strong microclimatic natural selection in this site with stressful environmental conditions appears to override migration in Drosophila at the microsite. The interslope differentiation could be ideally illustrative for learning about grnetic bases of environmental tolerance.

Genetic aspects, Evolution (Biology), Evolution, Longevity, Habitat selection, Heat

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Adaptive differentiation of thermotolerance in Drosophila along a microclimatic gradient

Article Abstract:

A study examines whether the physiological evolution of two Drosophila melanogaster populations on opposite slopes of Lower Nahal Oren, Mt. Carmel, Israel, despite a spatial separation of only 100-400 meters, was idiosyncratic and temporary, or persisted over multiple years. Results show that interpopulation differences in thermotolerance were stable despite year-to-year and seasonal variation in environmental conditions and potential inter-slope migration.

Science & research, Physiological aspects, Geotropism, Gravitropism, Seasonal variations (Reproduction)

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