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.
Results
Showing 1 to 20 of 80 for “"sex determination"”.
-
Sex Determination And Differentiation In The Common Snapping Turtle - A Reptile With Temperature-Dependent Sex Determination
<p>Temperature-dependent sex determination (TSD) was first discovered in an African lizard over 40 years ago. TSD has since been shown to be exhibited by many vertebrates including some fish and amphibians, numerous lizards, turtles, and all crocodilians studied to date. Although numerous questions …
-
Mammalian sex determination : appraising the role of the autosomes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1995.
-
Profiling gene expression during early gametophyte development and sex determination in Ceratopteris richardii
… male or hermaphroditic gametophyte. Gametophyte sex is determined by a GA-like pheromone (ACE) that is secreted by hermaphrodites approximately 6 days after spore inoculation and induces male development in other juvenile gametophytes. Our goal is to better understand the genetic and molecular …
-
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 …
-
Phenotypic plasticity in Mercurialis annua : the role of signal detection and response in sex determination
… to show phenotypic plasticity in terms of their sexual strategies. In androdioecious populations (males coexisting with cosexes), genetically labile males function as cosexes at low densities. At high densities, the frequency of males increases, while cosexes respond by increasing biomass …
-
Sex determination in southern flounder, Paralichthys lethostigma from the Texas Gulf Coast and implications of climate change
… Paralichthys, temperature plays a large role in sex determination. Thus, global climate change could have significant effects on southern flounder (Paralichthys lethostigma), a commercially and recreationally important flatfish whose populations have steadily declined in Texas in the last 25 …
-
Can plant survive without steroids: Modulation of plant architecture and sex determination through brassinosteroid biosynthesis and signaling
… plant architecture traits, including organ size, sex determination, and leaf angle. However, genetic mechanisms by which BRs regulate plant architecture traits in maize remain poorly understood. We have generated and characterized several brassinosteroid biosynthesis and signaling mutants that …
-
ACCURACY AND RELIABILITY IN SEX DETERMINATION USING THE OS COXA: A COMPARISON OF METRIC VS. PHENICE METHOD
Determination of biological sex is one of the most important determinations to be made from undocumented human remains and is an essential first step in the development of the biological profile in forensics and bioarchaeology. The chances of attaining high levels of accuracy & reliability …
-
Role of Genotype-by-Temperature Interactions in the Maintenance of Polygenic Sex Determination in the House Fly
Sex determination is the process by which sexually dimorphic developmental pathways are established. In genetic sex determination systems, a single master regulatory locus determines the sex of an individual. However, some organisms have multiple master sex determining loci in their genome that …
-
Incubators for Species which Exhibit Temperature-Dependent Sex Determination: Application to Hawksbill Sea Turtles in Rising Ambient Temperatures
… for species exhibiting temperature-dependent sex determination. This is the process by which the sex of an animal’s embryo is determined based on the temperature of environment in which it is incubated, which can result in skewed sex ratios within a population like in the case of the …
-
A mosquito-specific bZIP transcription factor and the influence of a Y-specific gene on sex determination in Anopheles stephensi
… is known about early embryonic development or sex determination in insects, in particular mosquitoes which are major vectors of worldwide disease. The goals of this work were to investigate a mosquito-specific transcription factor and its intronic miRNA cluster and characterize a novel Y …
-
Investigating the neurobiological basis underlying the sex-specific production of courtship song in Drosophila: the roles of sex determination genes fruitless and doublesex
… and carries vital species-specific information. Sex mosaic studies have shown that specific regions of the central nervous system (CNS) must be male in order to produce this courtship song. Indeed, two genes in the sex determination hierarchy, fruitless (fru) and doublesex (dsx), which are …
-
Genomic analysis of sex chromosomes and sex differentiation in Caricaceae
… excellent model species to study mechanisms for sex determination and sex chromosome evolution in plants, due to the presence of three sex types: female, male, and hermaphrodite. Previous research has revealed the location of the sex determination region (SDR) and the existence of three sex …
-
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 …
-
How Clonal Ants Clone: The Reproductive Biology of the Clonal Raider Ant, Ooceraca Biroi
… has (ploidy), whether the organism reproduces sexually or asexually, and how gametes are produced. Disentangling the rules of reproduction is therefore vital to understanding how evolution operates, and thorough study promises novel insights into fundamental cellular phenomena. In this thesis, …
-
Genomic dissection of structural variations and evolution forces of the sex chromosomes in spinach (spinacia oleracea)
Sex chromosomes evolved independently and repeatedly animals and plants. Although considerable differences existed among diverse lineages in terms of sexual dimorphism and genetic basis of sex determination, the underlining principles and evolutionary forces that lead to the formation and …
-
Approach to the identification of sex-determining genes in the tilapia genome by genetic mapping and comparative positional cloning
… most important traits for farming of tilapia is sex because monosex culture shows the best efficiency of culture. In tilapia, however, the mechanisms of sex-determination have been poorly understood because of the variation in the genetic basis of sex-determination and the lack of morphological …
-
The genetics of the sexually dimorphic deaths of the C. elegans CEM neutrons
… genes and 67 mutants generally defective sex determination. Another 29 screen isolates displayed a new defect of transcriptional de repression, the green pharynx phenotype. From these isolates and from additional screens, I defined a set of seven genes that function to prevent …
-
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 …
Page 1 of 4