Article Abstract:
Deletion analysis of the paternal sex ratio (PSR) supernumerary or B chromosome in the parasitoid wasp Nasonia vitripennis was done to determine whether nonfunctional PSR may be generated, to characterize the repeats on the chromosome and to identify possible functional domains. Deletion profiles showed that most repeats are organized in blocks on the chromosome and that functional domains of PSR can be deleted resulting in nonfunctional PSR that are transmitted to daughters. Nonfunctional deletion chromosomes were generated and transmitted highly through haploid males.
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Article Abstract:
The infinite island model has been studied with sex-differentiated gene flow. Identity measures have been derived. The expected difference in genetic differentiation of autosomal vs X-linked loci shows that sex-differentiated migration is possible and may help resolve questions. A difference between effective gene flow and the number of migrants adds to a possible disagreement between direct and indirect dispersal estimates.
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Article Abstract:
Lack of single-locus complementary sex determination in Asobara tabida and Alysia manducator, braconid wasps, has been studied. It was concluded that sl-CSD is not present in the species. This is the first study that shows the lack of sl-CSD in species of the Braconidae family. That hymenoptera sex-determining mechanisms can differ within a family. has also been shown.
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