Sterility
نویسنده
چکیده
منابع مشابه
Genetic complexity underlying hybrid male sterility in Drosophila.
Recent genetic analyses of closely related species of Drosophila have indicated that hybrid male sterility is the consequence of highly complex synergistic effects among multiple genes, both conspecific and heterospecific. On the contrary, much evidence suggests the presence of major genes causing hybrid female sterility and inviability in the less-related species, D. melanogaster and D. simula...
متن کاملCytoplasmic Genetic Male Sterility in Plants – a Molecular Perspective
Male sterility is defined as the failure of plants to produce functional anthers, pollen, or male gametes. First documentation of male sterility came in 1763 when Kölreuter observed anther abortion within species and specific hybrids. It is more prevalent than female sterility, probably because, male sporophyte and gametophyte less protected from environment than ovule and embryo sac. Male ster...
متن کاملSterility in Wheat Hybrids. I. Sterility Relationships and Endosperm Development.
Partial or complete sterility is of frequent occurrence in species crosses. Within the same genus certain species are sterile when crossed while ather combinations are completely fertile. Partial sterility may cause the elimination of certain classes of gametes and prevent desired recombinations of characters in the second generation. Sterility may also cause an abnormal vegetative development....
متن کاملSterility in Wild Roses and in Some Species Hybrids.
Variation in pollen sterility in the same individual in one season.. . . . . . . . . . . . . . . . . . . . . . Variation in pollen sterility in the sa Ovule sterility.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GENERAL DISCUSSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONCLUSION. . ...
متن کاملFertility Genes in Natural Populations of DROSOPHILA MELANOGASTER. I. Frequency, Allelism and Persistence of Sterility Genes.
Three or four percent of the wild flies in natural populations of D. melanogaster have been found to be sterile. An analysis of sterility associated with the second chromosome revealed a much lower frequency of genetically sterile flies. The accumulation of sterility genes in a cage population was proportional to that of lethal genes, as were their equilibrium frequencies in several natural pop...
متن کاملA complex genetic basis to X-linked hybrid male sterility between two species of house mice.
The X chromosome plays a central role in the evolution of reproductive isolation, but few studies have examined the genetic basis of X-linked incompatibilities during the early stages of speciation. We report the results of a large experiment focused on the reciprocal introgression of the X chromosome between two species of house mice, Mus musculus and M. domesticus. Introgression of the M. mus...
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