Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"relaxed selection"”.
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Comparative antifreeze trait analyses of Antarctic and temperate sister species pairs shed light on tempo of adaptive trait loss under relaxed selection
Antarctic notothenioid fishes endemic to the ice-laden, freezing (-1.9°C) Southern Ocean survive by having evolved antifreeze glycoproteins (AFGP). Over evolutionary time several lineages have escaped the isolated frigid Southern Ocean to north of the Antarctic Polar Front and successfully …
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Evolution of gender associated mitochondrial DNA in bivalves
… type and it is hypothesized that this is due to relaxed selection on the M genome. Lastly, the Mytilus F type mtDNA has been shown to evolve more rapidly than other metazoan mtDNA and this is also hypothesized to be due to relaxed selection on the F genome. I examined the evolution of DUI in the …
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Defining Mechanisms Contributing to Porcine MHC Class II Diversity
… compared to the domestic populations may suggest relaxed selection in the domestic populations at the DQB locus. Taken together, these data suggest that MHC polymorphisms have been selectively maintained, possibly by balancing selection, having overcome the effects of nonselective factors, …
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Investigating the role of gene duplication in the evolution and divergence of Arachnids
… that can contribute to organismal divergence. Relaxed selection on duplicates allows for the accumulation of mutations in coding and/or regulatory sequences of duplicated genes leading to subfunctionalization and/or neofunctionalization. Recent studies of spiders and scorpions have revealed a …
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Dialect formation in fragmented populations of the endangered North Island kokako (Callaeas wilsoni)
… song convergence may then occur due to social selection or chance events. The effects of population size on song attributes, repertoires and sharing, vocal versatility and syntactical structure were examined within the six largest natural populations, as well as two translocated populations of …
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The influence of environmental temperature on the thermal tolerance of Antarctic notothenioid fishes
… share low freezing points, the absence of selection for heat tolerance in the chronically cold Southern Ocean has over evolutionary time resulted in their modern limited heat tolerance. To determine whether differences in environmental temperature between the HAZ and SPZ are also correlated …