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 10 of 10 for “"evolution of sex"”.
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Testing the Major Theories Concerning the Evolution of Sex using Experimental Evolution
The evolution of sexual reproduction has been dubbed "the queen of problems in evolutionary biology". While there is a large amount of theory about the evolution of sex, there is relatively little well controlled empirical data. This thesis is an attempt to use an experimental evolution based …
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The Evolution of Sex Determination and the DMRT1 Gene in the Japanese Gecko (Gekko japonicus)
There are different sex-determining mechanisms in our environment, which are separated into two groups known as genotypic sex determination (GSD) and environmental sex determination. The most well-known mechanism in the ESD group is temperature-dependent sex determination (TSD). In this study, the …
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Sequence of the chicken sex chromosomes
… in mammals, the chromosome complement determines sex. Male birds are designated ZZ, female ZW. Mammals have the opposite system; males are XY and females XX. Both the avian ZW and mammalian XY pair are believed to have evolved from autosomes, with dramatic changes, both gene loss as well as gene …
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The study of ancient viral class II envelope fusion proteins within the viral retroelements of Nematoda and the nuclear plasmids of Dictyostelium
… class I envelope fusion protein. A subset of Bel/Pao LTR-retrotransposons within the phylum Nematoda have acquired a phlebovirus-like env and utilized the encoded fusion machinery to escape the genome as intact and novel exogenous retrovirus. This includes C. elegans retroelement 13 virus …
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Functional characterization and analysis of Carica papaya SHORT VEGETATIVE PHASE (CpSVP)
… nutritional benefits and medicinal applications. Sex in papaya is controlled by a pair of nascent sex chromosomes with two slightly different Y chromosomes that distinguish males (XY) and hermaphrodites (XYh). These two Y chromosomes diverged about 4,000 years ago with only 0.4% sequence …
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Distribution of chemistry and sexual fecundity in the lichenized-fungi, Xanthoparmelia cumberlandia and Xanthoparmelia coloradoensis on Boulder Mountain, Aquarius Plateau, UT
<p>Three aspects of <em>Xanthoparmelia cumberlandia</em> and <em>Xanthoparmelia coloradoënsis</em> populations found at two elevations are explored: clustering of secondary chemicals and the resulting implications for taxonomic distinctions, the usefulness of thallus size as an indirect measure of …
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Sex chromosome evolution of papaya: Dynamic structural and expression changes and identification of associated traits
Sex chromosomes are found throughout many diverse lineages across the animal and plant kingdom. Most of the sex chromosomes that have been studied are well established and have already experienced many evolutionary forces, making it difficult to reconstruct the dynamic changes involved in the …
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Molecular analysis of the sex-determining region of the Y chromosome in the platyfish Xiphophorus maculatus
A large variety of sex determination systems have been described in fish. However, almost no information is available about sex determination in the classical fish models, the zebrafish Danio rerio and the pufferfish Takifugu rubripes. A DNA-binding protein gene called dmrt1bY (or DMY) has been …