Sex Chromosome Meiotic Drive
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منابع مشابه
Sex-ratio meiotic drive and Y-linked resistance in Drosophila affinis.
Genetic elements that cheat Mendelian segregation by biasing transmission in their favor gain a significant fitness benefit. Several examples of sex-ratio meiotic drive, where one sex chromosome biases its own transmission at the cost of the opposite sex chromosome, exist in animals and plants. While the distorting sex chromosome gains a significant advantage by biasing sex ratio, the autosomes...
متن کاملSex Chromosome Meiotic Drive in DROSOPHILA MELANOGASTER Males.
In Drosophila melanogaster males, deficiency for X heterochromatin causes high X-Y nondisjunction and skewed sex chromosome segregation ratios (meiotic drive). Y and XY classes are recovered poorly because of sperm dysfunction. In this study it was found that X heterochromatic deficiencies disrupt recovery not only of the Y chromosome but also of the X and autosomes, that both heterochromatic a...
متن کاملSuppression of Sex-ratio Meiotic Drive and the Maintenance of Y-chromosome Polymorphism in Drosophila.
Like several other species of Drosophila, D. quinaria is polymorphic for X-chromosome meiotic drive; matings involving males that carry a "sex-ratio" X chromosome (XSR ) result in the production of strongly female-biased offspring sex ratios (Jaenike 1996). A survey of isofemale lines of D. quinaria from several populations reveals that there is genetic variation for partial suppression of this...
متن کاملA sex-ratio Meiotic Drive System in Drosophila simulans. II: An X-linked Distorter
The evolution of heteromorphic sex chromosomes creates a genetic condition favoring the invasion of sex-ratio meiotic drive elements, resulting in the biased transmission of one sex chromosome over the other, in violation of Mendel's first law. The molecular mechanisms of sex-ratio meiotic drive may therefore help us to understand the evolutionary forces shaping the meiotic behavior of the sex ...
متن کاملReproductive Isolation and X Chromosome Meiotic Drive in Cyrtodiopsis Stalk-eyed Flies
Title of Document: REPRODUCTIVE ISOLATION AND X CHROMOSOME MEIOTIC DRIVE IN CYRTODIOPSIS STALK-EYED FLIES. Sarah J. Christianson, Doctor of Philosophy, 2008 Directed By: Professor Gerald Wilkinson, Department of Biology Haldane’s rule states that when one sex of hybrids shows sterility or inviability it tends to be the heterogametic sex. This pattern is considered a fundamental law of speciatio...
متن کاملThe Contribution of Female Meiotic Drive to the Evolution of Neo-sex Chromosomes
Sex chromosomes undergo rapid turnover in certain taxonomic groups. One of the mechanisms of sex chromosome turnover involves fusions between sex chromosomes and autosomes. Sexual antagonism, heterozygote advantage, and genetic drift have been proposed as the drivers for the fixation of this evolutionary event. However, all empirical patterns of the prevalence of multiple sex chromosome systems...
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