Haplodiploid
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Mathematical theory of group selection: Structure of group selection in founder populations determined from convexity of the extinction operator*
Genetic analysis for group selection is developed for the case of a biallelic locus (A, a) undergoing group selection of founder populations only. By contrast to R. Levins“E = E(x) models, extinction now depends on genetics at the propagule stage but acts uniformly on larger populations. Biological evidence supports this hypothesis, which also allows mathe
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14. Wolbachia-induced parthenogenesis in a genus of phytophagous mites.
The vertically transmitted endosymbiotic bacterium Wolbachia modifies host reproduction in several ways in order to enhance its own spread. One such modification results in the induction of parthenogenesis, where males, which are unable to transmit Wolbachia, are not produced. Interestingly, parthenogenesis-inducing Wolbachia have only been found within hapl
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15. On the Opportunity for Polymorphism with Sex-Linkage or Haplodiploidy
This paper addresses the assertion that X-linked and haplodiploid genetic systems are inherently limited with respect to the potential for selectively maintained genetic polymorphisms. Using a variation of Haldane and Jayakar's (1964) parameterization of selection on an X-linked locus, analytical expressions are derived for the proportion of the total parame
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16. Experimental Analysis of a Paternally Inherited Extrachromosomal Factor
Virtually all known cases of extrachromosomal inheritance involve cytoplasmic inheritance through the maternal line. Recently, a paternally transmitted factor that causes the production of all-male families has been discovered in a parasitic wasp. The wasp has haplodiploid sex determination: male offspring are haploid and usually develop from unfertilized e
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17. Functional haplodiploidy: a mechanism for the spread of insecticide resistance in an important international insect pest.
The coffee berry borer, Hypothenemus hampei, is the most important insect pest of coffee worldwide and has an unusual life history that ensures a high degree of inbreeding. Individual females lay a predominantly female brood within individual coffee berries and because males are flightless there is almost entirely full sib mating. We investigated the genetic
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18. Intensive Linkage Mapping in a Wasp (Bracon Hebetor) and a Mosquito (Aedes Aegypti) with Single-Strand Conformation Polymorphism Analysis of Random Amplified Polymorphic DNA Markers
The use of random amplified polymorphic DNA from the polymerase chain reaction (RAPD-PCR) allows efficient construction of saturated linkage maps. However, when analyzed by agarose gel electrophoresis, most RAPD-PCR markers segregate as dominant alleles, reducing the amount of linkage information obtained. We describe the use of single strand conformation po
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19. Deletion Analysis of the Selfish B Chromosome, Paternal Sex Ratio (Psr), in the Parasitic Wasp Nasonia Vitripennis
Paternal Sex Ratio (PSR) is a ``selfish'' B chromosome in the parasitoid wasp Nasonia vitripennis. It is transmitted via sperm, but causes supercondensation and destruction of the paternal chromosomes in early fertilized eggs. Because this wasp has haplodiploid sex determination, the effect of PSR is to convert diploid (female) eggs into haploid (male) eggs