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 50 for “"Sex chromosomes"”.
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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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Characterization of the sex chromosomes in spinach
Plant sex chromosomes have evolved from the autosomes of hermaphroditic species to maintain dioecy. The major barriers to sex chromosome characterization have been the inherent difficulties of working with a non-recombining sex determining region that make sequencing and mapping the Male-Specific …
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Resolution of sex chromosomes in waterhemp and Palmer amaranth
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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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 …
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Transition states in the evolution of the mammalian sex chromosomes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1998.
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Regulation of Chromatin Landscape on and by the Human Sex Chromosomes
Sex chromosome constitution is the largest and oldest source of genetic variation in the human population. One sex chromosome—the “active X” (Xa)—is present in all individuals. The second sex chromosome differs between sexes; most males have a Y while most females have a second X, which adopts a …
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Understanding the effects of sex chromosomes and sex hormones on sex differences
Biological factors that determine sex and drive sexual differentiation have long been established in humans and other mammalian species. Yet there is a limited understanding of the mechanisms by which these factors give rise to sex-biased outcomes in health and disease. Growing evidence for sex …
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Frequency of Copy Number Variants Involving The Sex Chromosomes In A Clinical Setting
… in phenotype, in which ways and to what extent sex chromosomes are involved has not been fully described. We performed a secondary data analysis using the DECIPHER database on 2,273 de-identified individuals with 2 CNVs. CNVs were designated primary and secondary based on our criteria and …
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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 …
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Genetic modification of the homomorphic sex chromosomes in the yellow fever mosquito Aedes aegypti provides novel insights and tools for biocontrol
… transmit pathogens, efficient and accurate sex separation of the non-biting males from the biting females is essential. Genetic sexing strains often rely on marker genes linked to the sex chromosomes. Sex linkage is more challenging in Ae. aegypti than many other species due to the …
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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 sex chromosome evolution in papaya
Sex chromosomes are of great interest due to their role in sexual reproduction. Sex chromosomes evolve through the suppression of recombination in the sex determining region between the X and Y chromosomes which allows for each region to evolve and change independently. Papaya’s trioecious sex is …
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Dissecting the evolutionary forces shaping sex chromosome evolution in papaya
… size. The highly degenerated nature of the human sex chromosomes make it impossible to trace the events that lead to their inception. Several theories have been proposed for how sex chromosomes evolve and the forces that shape their evolution, but complete sequence information is needed to test …
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Alu retrotransposition-mediated genomic variation within the primate order
… biology. In a computational survey of the human sex chromosomes, 344 recently integrated Alu elements were detected and subjected to empirical testing by polymerase chain reaction to determine presence/absence polymorphism. Sixteen elements were found to be polymorphic on the X chromosome, and …
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Karyotype polymorphism in indigeneous goats from two Zambian provinces
… Goats from these two regions had had 60 diploid chromosomes number (58 autosomes and 2 sex-chromosomes). Mazabuka had the lowest mean relative chromosome length of 3.21 (with a 95 percent confidence interval of 2.71 to 3.71) while Gwembe and katete had highest mean relative chromosome length …
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Karyotype polymorphism in indigeneous goats from two Zambian provinces
… Goats from these two regions had had 60 diploid chromosomes number (58 autosomes and 2 sex-chromosomes). Mazabuka had the lowest mean relative chromosome length of 3.21 (with a 95 percent confidence interval of 2.71 to 3.71) while Gwembe and katete had highest mean relative chromosome length …
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Regulation of human sex-linked homologs DDX3X and DDX3Y and phenotypic consequences
… of 17 gene pairs retained on the human X and Y chromosomes during their evolution from ordinary autosomes; both genes are widely expressed in human tissues. Mutations of DDX3X and DDX3Y result in a wide range of sex-dependent phenotypes, necessitating the study of their regulation. In this …
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Chromosomal Evolution Among North American Microtine Rodents
… a loss in centromeric heterochromatin to occur. Sex chromosomes exhibit a variety of C-banding patterns ranging from being completely euchromatic to having large heterochromatic additions. Ag-NORs were found at three chromosomal locations: centromeric, telomeric, and interstitial. There is …
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