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Evolutionary Morphology Of The Speckled Rattlesnakes (viperidae: Crotalus Mitchellii Group)
(Biology, 2009-09-16)
I examined various facets of morphological variation and evolution in the speckled rattlesnake (Crotalus mitchellii) species group. I performed three separate, but related, studies pertaining to the following topics: body ...
The Evolutionary History And Genomic Impact Of Mammalian Dna Transposons
(Biology, 2009-09-16)
Transposable elements (TEs) are mobile repetitive sequences that make up large fractions of mammalian genomes, including at least 45% of the human genome. Class 2, or DNA intermediate transposons, which make up approximately ...
Determining the phylogeographic dynamics of the edge relationships between Aphonopelma hentzi (Girard) and its neighbors along the Colorado River Basin (Araneae, Mygalomorphae, Theraphosidae)
(Biology, 2009-09-16)
Theraphosids, commonly known as “tarantulas”, are a group of large, hirsute spiders that have drawn relatively little interest in ecological, behavioral, or evolutionary research from biologists. The lack of research on ...
Ecological Genetics Of Adaptive Life-history Phenotypes In The Cricket Allonemobius socius
(Biology, 2009-09-16)
As many organisms inhabit unstable environments, the ability to respond to changing environmental conditions is highly adaptive, and results in the evolution of phenotypic plasticity. Thus, identifying the genetic basis ...
Analysis Of Novel Regulatory Region And Function Of A Young Drosophila Retrogene: Dntf-2r
(Biology, 2009-09-16)
Dntf-2r is a young retroposed gene that originated from the nuclear transport gene Dntf-2. Here the function, quality and evolutionary origin of the regulation of this retrogene are explored. In Chapter 1, I introduce the ...
Sequence Evolution Of Recurrently Recruited Retroposed Genes In Drosophila And Their Possible Role In Meiotic Drive
(Biology, 2009-09-16)
Gene duplications are a valuable source of genetic information that can evolve under positive selection creating a new gene function without affecting the original function.A gene duplication mechanism is retroposition. ...
How Soil Nutrient Availability Affects Plant Sexual Reproduction And Seedling Recruitment In Alaskan Dry Heath Tundra: Implications For Response To Climate Change
(Biology, 2009-09-16)
The harsh growing conditions of the arctic biome, in particular low temperatures and soil nutrient availability, restrict the growth and reproduction of arctic plant species. Recent and ongoing changes in climate are ...
Natural Hybridization And Speciation In Toads Of The Anaxyrus americanus Group.
(Biology, 2009-09-16)
The goal of speciation research is to elucidate the processes that lead to the formation of new species. Examining natural hybridization and the evolution of reproductive isolating barriers provides an opportunity to ...
An Analysis Of Tracheid Length Versus Age In A 4842-year Old Bristlecone Pine (Pinus longaeva D.K. Bailey) Called Prometheus
(Biology, 2009-09-16)
After felling, it was revealed that Prometheus, an ancient bristlecone pine (Pinus longaeva D.K. Bailey) located in the Great Basin National Park, had been the oldest living organism at over 5000 years of age. Great Basin ...
Morphology And Habitat Use Among Insular Populations Of The Lizard Anolis lemurinus From The Cayos Cochinos Archipelago Of Honduras
(Biology, 2009-09-16)
In Honduras, Anolis lemurinus is distributed along the Atlantic versant of the mainland and on the Caribbean island system consisting of the Bay Islands and Cayos Cochinos archipelagos. In the Cayos Cochinos, A. lemurinus ...