Genetic conflict and sex chromosome evolution games in Elizabeth

Segregation distorters can arise on all chromosomes, but are particularly important in species with chromosomal sex determination for brevity, we will refer to the heterogametic sex as male and the sex chromosomes as X and Y, except where we explicitly compare XY and ZW systems.

Male sterility in natural populations of genetic conflict and sex chromosome evolution games in Elizabeth plants. For example, cytoplasmic genes, which are maternally inherited, will maximize their fitness if their host produces a female-biased sex ratio Figure 1.

Science News. Journal of Proteome Research16 12 Three independent sex-ratio systems have been described from D.

genetic conflict and sex chromosome evolution games in Elizabeth

Faced with inequality: chicken do not have a general dosage compensation of sex-linked genes. Genetics of postzygotic isolation and Haldane's rule in haplodiploids. Because such selfish elements on sex chromosomes can reduce fertility and distort the sex ratio of progeny, unlinked suppressors are expected to evolve, bringing different regions of the genome into conflict over the meiotic transmission of the sex chromosomes.

Koevoets T, Beukeboom LW.

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To gain a transmission advantage, segregation distorters must meet two conditions. Lewis DL. Burt A, Trivers R. Box 2 Figure I. Haig D, Grafen A. Sex chromosomes and speciation in Drosophila. Boy or Girl?

There is no large X-effect for interspecific differences in other male sexual phenotypes, such as genital morphology [ 73 , 79 ], indicating that a greater efficacy of selection in the hemizygous sex cannot be a general explanation for the large X-effect on hybrid sterility [ 55 ].

Hanson MR, Bentolila S. Cytological and ultrastructural data reveal that as a result of the activity of Dox and MDox , Y-bearing sperm do not mature normally, apparently due to a failure in sperm nuclear condensation [ 51 ]. Silencing of unpaired chromatin and histone H2A ubiquitination in mammalian meiosis.

Genetic conflict and sex chromosome evolution games in Elizabeth

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  • Genetic conflict over sex chromosome transmission might also contribute to two well-known patterns of reproductive isolation: the large contribution of the sex chromosomes to hybrid sterility (the large X-effect), and Haldane's rule. J.B.S. Haldane observed that in interspecific crosses, unisexual inviability or sterility predominantly affects Cited by: Apr 01,  · Genetic conflict over sex chromosome transmission might also contribute to two well-known patterns of reproductive isolation: the large contribution of the sex chromosomes to hybrid sterility (the large X-effect), and Haldane's rule. J.B.S. Haldane observed that in interspecific crosses, unisexual inviability or sterility predominantly affects Cited by:
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  • Chromosomal sex determination systems create the opportunity for the evolution of selfish genetic elements that increase the transmission of one sex chromosome at the expense of its homolog. Because such selfish elements on sex chromosomes can reduce fertility and distort the sex ratio of progeny, unlinked suppressors are expected to evolve, bringing different regions of the genome into Cited by: Genetic conflict and sex chromosome evolution Colin D. Meiklejohn1 and Yun Tao2 1Department of Biology, University of Rochester, Rochester, NY , USA 2Department of Biology, Emory University, Atlanta, GA , USA Chromosomal sex determination systems create the opportunity for theevolutionof selfishgenetic elements.
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  • Jan 01,  · THE differential expression of mammalian genes depending on the sex of the parent from which they are inherited is known as genomic imprinting (B arlow ; F ranklin et al. ; J ohn and S urani ; B artolomei and T ilghman ).In its typical form, imprinting is the nonexpression in at least some tissues for some period of development of a paternally or maternally derived 51digg.info by: Jan 06,  · As a result of genetic conflict over sex chromosome transmission, molecular incompatibilities can evolve between components of the MSCI machinery, causing sterility in .
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