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 20 of 175 for “"Sexual dimorphism"”.
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Sexual Dimorphism in Permanent Human Dentition
Sexual dimorphism refers to differences between males and females of the same species. A general pattern of sexual dimorphism is displayed in humans. Across mammalian populations, males generally have a larger body than females. Many studies have shown that, as body mass increases, tooth volume …
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Investigating Sexual Dimorphism in Ceratopsid Horncores
Evidence for sexual dimorphism was investigated in the horncores of two ceratopsid dinosaurs, Triceratops and Centrosaurus apertus. A review of studies of sexual dimorphism in the vertebrate fossil record revealed methods that were selected for use in ceratopsids. Mountain goats, bison, and …
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Cranial Sexual Dimorphism in Hispanics Using Geometric Morphometrics
… specific in that human groups differ in size. Sexual dimorphism in the cranium has been explored in American Whites and Blacks (Kimmerle et al., 2008), but little is understood concerning sexual dimorphism in Hispanics; the fastest growing US population (Martinez and Ariosto, 2011). A better …
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Tibial-fibular morphology: variation, sexual dimorphism, and mechanical implications
Stress fractures are common injuries among runners and military personnel associated with the mechanical fatigue of load-bearing bone. The tibia is the most frequently fractured site and females are at much greater risk than males. Bone geometry and density are hypothesized risk factors for stress …
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Correlated response and sexual dimorphism in bidirectional selection experiments
… traits, and (2) the study of the inheritance of sexual dimorphism or body weight. The first experiment included data from four generations of double two-way selection for body weight and breast angle at eight weeks of age. Breast angle was considered a correlated trait in the weight subpopulation …
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Sexual dimorphism in the genus Leucadendron : Morphology and plant hydraulics
… dioecious species that vary in their degree of sexual dimorphism. Males are generally more highly ramified (branched) with smaller leaves compared to corresponding females. It has been hypothesised that sexual dimorphism in Leucadendrons is linked to serotiny (a fire-adapted reproductive …
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Sexual Dimorphism and Consequences of Sex-Specific Selection in Drosophila melanogaster
… by sex-biased geneexpression. Most of this sexual dimorphism is thought to arise because selection favours divergent phenotypes in the sexes. With Drosophila melanogaster as the study organism, my thesis takes several approaches to investigate sexual dimorphism and the implications of sex …
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Sex And Heterochromatin: An Investigation Of Sexual Dimorphism In Drosophila Melanogaster
… heterochromatin is generally not thought to be sexually dimorphic. The genetic basis for the regulation of sex-specific heterochromatin was completely unknown. </p> <p>To determine if roX RNAs localize directly at the heterochromatic regions that they regulate, I generated an MS2-tagged roX1 …
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Sexual dimorphism, resource partitioning and intraspecific aggression in Caprella californica Stimpson
… ~- californica is dioecious and has marked sexual dimorphism in both its size and secondary sex characteristics. It is found from San Diego to the South China Sea (Laubitz, 1970), and is the dominant caprellid in the Zostera marina beds of the local bays and is a major diet item for many of …
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The Genetic and Neural Basis of Sexual Dimorphism in Mosquito Behavior
… behavior. We found that these neurons show sexual dimorphism in their inputs, as female 11211-expressing neurons receive input from sensory neurons that detect the taste of blood. When we silenced the activity of these 11211-expressing neurons, females were able to feed on nectar and retain …
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Sexual Dimorphism and Socioeconomic Status: Comparison between Migrant and Non-migrant Populations
Variation in sexual dimorphism is related to average body size differences and limb proportions between males and females between and within populations (Charisi et al. 2011). The Female Buffering Hypothesis suggests that expression of sexual dimorphism relies on male susceptibility to impairment …
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Investigating genetic and molecular factors contributing to sexual dimorphism in lung disease
… pervasive respiratory diseases that demonstrate sexual dimorphism. Male children experience increased asthma rates and worse health outcomes than female children, with this trend reversing after puberty. Importantly, sex differences exist for the hallmark features of asthma and COPD in …
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Sexual Dimorphism and Behavioral Responses to Conspecific Chemical Cues in Pagurus samuelis
Anatomical differences were observed between sexes of P. samuelis. We measured the major cheliped and carapace lengths of hermit crabs caught off the coast of Southern California and found that male chelipeds were significantly larger relative to their carapace length than female chelipeds. Average …
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Sexual Dimorphism and Trophic Trait Evolution in the Carolina Bay Fundulus Complex
… and speciation, but lately the roles of sexual selection and sexual dimorphism have also been considered in the studies of speciation and adaptive radiation. In the present study I investigated a to date little studied system, the Carolina Bay Fundulus species complex, in which patterns …
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Shape variability and sexual dimorphism of the chin: a 3D geometric morphometric analysis
Εισαγωγή: Βάσει των εξελικτικών θεωριών, ο πώγωνας αποτελεί ένα ανατομικό στοιχείο μοναδικό στον άνθρωπο, με αξιοσημείωτη προσαρμοστικότητα στις ιδιαιτερότητες που επέβαλαν οι συνθήκες και οι ανάγκες κάθε σταδίου εξέλιξης από την εμφάνιση του ανθρώπου στη Γη. Το ενδιαφέρον των επιστημόνων έχει …
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Sexual Dimorphism in Susceptibility to Age-Dependent Metabolic Disorders in Mice Born through ICSI
Intracytoplasmic sperm injection (ICSI), as an assisted reproductive technology (ART), has been increasingly used in human fertility clinics to treat male infertility and achieve pregnancy. Consequently, the majority of the so-called "test-tube babies" are born through ICSI nowadays. Many studies …
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Root Morphology and Sexual Dimorphism : Size Standards for Crown and Root Dimensions in Adolescents
<p>“Early” or two-phase orthodontic treatment of Class II malocclusions is a highly debated topic in the orthodontic literature. We report here on a retrospective cephalometric study of patients with Class II, division 1 malocclusions. One group consisted of 32 consecutively treated patients who …
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Genetic and Sex Steroid Hormone Contributions to the Sexual Dimorphism in Murine Experimental Allergic Encephalomyelitis
… that adult gonadal hormones selectively regulate sexually dimorphic quantitative traits observed in EAE at the clinical, histopathologic, and genetic levels. Furthermore, we identified specific genetic linkages to chromosomes 3, 4, and 7 which were dependent on the presence or absence of gonadal …
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