Chromosome aberrations in field strains of Blattella germanica

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dc.contributor.authorCrouch, Joelle H.en
dc.contributor.committeechairRoss, Mary H.en
dc.contributor.committeememberCochran, Donald G.en
dc.contributor.committeememberEsen, Asimen
dc.contributor.departmentEntomologyen
dc.date.accessioned2014-03-14T21:34:04Zen
dc.date.adate2009-04-18en
dc.date.available2014-03-14T21:34:04Zen
dc.date.issued1993-07-05en
dc.date.rdate2009-04-18en
dc.date.sdate2009-04-18en
dc.description.abstractResistant and susceptible field strains of the German cockroach were compared for possible chromosome aberrations. Resistant strain females produced significantly higher numbers of aberrant oothecae ( >5 unhatched eggs ) than the susceptible strains. Chromosome aberrations found in the susceptible strains were attachments (autosome-autosome, autosome-x) and fragments that did not reappear in outcrosses. Attachments (autosome-autosome, autosome-x), fragments, three translocation configurations that did not reappear in outcrosses and two reciprocal translocation heterozygotes occurred in the resistant strains. These two translocations have been tentatively identified as T(12:8)/12:8 from the Bowl strain and T(11:6)/11:6 from the K851 strain. T(12:8)/12:8 exhibits random disjunction at metaphase I. There were no differences related to susceptible vs. resistant strains in the frequency of chromosome aberrations from the aberrant oothecae. There was no evidence, except in the K851 strain, to support a relationship between egg arrest and chromosome aberrations, or the hypothesis that chromosome aberrations result from the selective pressure of insecticides. It is suggested by this study that translocations are the most common type of “floating” polymorphism in the German cockroach. The first occurrence of three known phenotypic mutants, bent bristle, yellow body, and pallid eye, and one new phenotypic mutant, colorless eye, in field strains are reported by this study.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 49 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04182009-041147en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04182009-041147/en
dc.identifier.urihttp://hdl.handle.net/10919/42132en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.C768.pdfen
dc.relation.isformatofOCLC# 29040713en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.C768en
dc.subject.lcshBlattella germanicaen
dc.subject.lcshChromosome abnormalitiesen
dc.titleChromosome aberrations in field strains of Blattella germanicaen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEntomologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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