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 9 of 9 for “"Unisexual"”.
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Stealing, scavenging, or storing? Breeding behaviors of unisexual Ambystoma salamanders
<p>The unisexual <em>Ambystoma</em> salamander complex is a lineage of all-female salamanders that use a unique form of reproduction: kleptogenesis. Kleptogenesis requires sperm from male salamanders of co-occurring sexual species, potentially putting unisexual and sexual females in breeding …
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Temporal changes in unisexual and sexual Ambystoma salamander populations in southeast Michigan
… that can lead to shifts in population structure. Unisexual (all female) <em>Ambystoma</em> salamanders reproduce via kleptogenesis, resulting in ploidy-variable offspring. I analyzed genetic data of historic and modern-day unisexual and <em>A. laterale</em> samples from the University of …
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Survivorship of ploidy-variable unisexual <i>ambystoma</i> aalamanders across developmental stages
<p>Unisexual <em>Ambystoma</em> produce ploidy-variable offspring that differ in survivorship to adulthood. These populations reproduce through kleptogenesis, persisting by stealing genetic material from males of compatible bisexual <em>Ambystoma</em> species (e.g., Jefferson's Salamander <em>A. …
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Dioecious Plants: Evolution And Sex Ratio And Asepen Decline
… that incest and dispersal specialization of unisexual individuals facilitate invasion, but through the interaction of specialization, incest, and compensation, unisexual invasion occurs much more consistently and under less stringent conditions then previously modeled. Finally, we found that …
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A taxonomic revision of the spiny members of subfamily celastroideae (Celastraceae) in Southern Africa
… dichasial inflorescences, and mainly unisexual flowers. A new genus, Gloveria, is described. Taxa proposed are: four species (one new combination) in Putterliclda; one species in Gloveria; 31 species and three subspecies in Gymnosporia (nine new sections, nine new combinations, seven …
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Gender Variation in CROTON CALIFORNICUS (EUPHORBIACEAE)
… of monoecious morphs, cosexual plants with unisexual flowers. Gender variation was quantified for cosexual plants by calculating the Estimated Floral Gender (EFG) which varied from 1.00 (female) to 0.00 (male). The distribution of the EFG was highly skewed towards maleness. Monoecious …
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Sex Chromosome Evolution in Blow Flies
… system, are monogenic (females produce unisexual progeny), have two types of females (arrhenogenic females – male producers and thelygenic females – female producers), and sex of the offspring is determined by the maternal genotype. To accomplish these tasks, a total of nine male and …
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Increased levels of ploidy in A. texanum-dependent A. platineum (JJL) populations in eastern Illinois: conservation implications for the state endangered species
The silvery salamander, Ambystoma platineum, listed as endangered in Illinois, originated from the hybridization between Ambystoma jeffersonianum and Ambystoma laterale. A. platineum are triploid (JJL) and usually reproduce gynogenetically using one of the parental species as a sexual host. There …
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Female sterility and carpel development in plants
… bisexual flowers are the ancestral condition. Unisexuality evolves from hermaphroditism by the process of random mutations affecting the female organ (carpel) or male organ (stamen) abortion. The ABCE model of floral development provides a basic underlying developmental framework of individual …