Global ETD Search
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Showing 1 to 11 of 11 for “"Sex chromosome evolution"”.
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Sex Chromosome Evolution in Blow Flies
Chromosomal mechanisms of sex determination vary greatly in phylogenetically closely related species, indicative of rapid evolutionary rates. Sex chromosome karyotypes are generally conserved within families; however, many species have derived sex chromosome configurations. Insects display a …
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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
The human Y chromosome is an ancient relic of its autosomal precursor; most of the genes have been lost in its 166 million years of separation from the X, and it has drastically shrunken in size. The highly degenerated nature of the human sex chromosomes make it impossible to trace the events that …
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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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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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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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The generation and maintenance of diversity in a rapid adaptive radiation
… fishes are a pre-eminent example of adaptive evolutionary radiation. The diversity of species (nearly 1000 extant) is mirrored by an array of variation in dozens of phenotypes (e.g. trophic morphology, tooth shape, color patterns, behavior, development). The unique characteristics of this …
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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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Epigenetics and sex expression in trioecious papaya
Sex determination in papaya is regulated by a pair of recently evolved sex chromosomes. Genomic and genetic studies over the past century have made significant achievements towards the understanding of the sex determination system in papaya. However, the epigenetic aspects of sex determination and …