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Full-Text Articles in Life Sciences
Can Genetically Engineered Crops Become Weeds?, Kathleen H. Keeler
Can Genetically Engineered Crops Become Weeds?, Kathleen H. Keeler
School of Biological Sciences: Faculty Publications
There are significant differences if the distribution of weedy characteristics among weeds, normal plants, and crops. The world’s most serious weeds possess on the average 10 or 11 of these characters, a random collection of British plants have an average seven of the traits, and crop plants only five. For the average crop to become as “weedy” as the average weed, it would need to acquire five weedy traits. Even using the unlikely assumption that those traits are single loci in which a dominant mutation would provide the weedy character, this would require the simultaneous acquisition of five gene substitutions. …
Field Playback Of Male Display Attracts Females In Lek Breeding Sage Grouse, Robert M. Gibson
Field Playback Of Male Display Attracts Females In Lek Breeding Sage Grouse, Robert M. Gibson
School of Biological Sciences: Faculty Publications
Recent correlational studies of lekking sage grouse suggest that male vocal display attracts females. To test this hypothesis further, the natural displays of a territorial male were supplemented with the tape-recorded display of another reproductively successful individual. Significantly, more females approached the speaker's location on days when the recording was played, and also on nonplayback days immediately following a playback, than on other nonplayback days. Analysis of male displays indicated that females were responding to the playback itself rather than to changes in male behavior. The "after-response" following a playback suggests that some females present during a playback remembered its …
Trichome Development In Arabidopsis Thaliana. 1. T-Dna Tagging Of The Glabrous1 Gene, M. David Marks, Kenneth A. Feldmann
Trichome Development In Arabidopsis Thaliana. 1. T-Dna Tagging Of The Glabrous1 Gene, M. David Marks, Kenneth A. Feldmann
School of Biological Sciences: Faculty Publications
Progeny from a transformed Arabidopsis plant (produced by the Agrobacterium-mediated seed transformation procedure) were found to be segregating for an altered trichome phenotype. The mutant plants have normal leaf trichomes but completely lack trichomes usually found on the stem. The mutation is tightly linked to a T-DNA insert. Complementation analysis with genetically characterized trichome mutants revealed that the new mutation is an allele of the GL1 locus. The new trichome mutant has been designated gl1-43. DNA gel blot analysis indicated that the insert site contains a complex array of at least four tandemly linked T-DNA units oriented as both …
Dispersion Of Displaying Male Sage Grouse Ii. The Role Of Female Dispersion, J. W. Bradbury, Robert M. Gibson, C. E. Mccarthy, S. L. Vehrencamp
Dispersion Of Displaying Male Sage Grouse Ii. The Role Of Female Dispersion, J. W. Bradbury, Robert M. Gibson, C. E. Mccarthy, S. L. Vehrencamp
School of Biological Sciences: Faculty Publications
The degree to which male sage grouse select lek sites and females select nesting sites to maximize proximity to the other sex was examined by contrasting male dispersions with the dispersions and movements of females in the months preceeding incubation. Wintering females exhibit highly overlapping ranges due to shared use of central refuging areas. In late winter and early spring, females move an average 9 km from wintering areas to select nest sites and males begin occupying leks. Pooled evidence suggests that females select nest sites independently of male dispersion whereas males adjust lek occupation so as to maximize proximity …
Trichome Development In Arabidopsis Thaliana. Ii. Lsolation And Complementation Of The Glabrous1 Gene, Patricia L. Herman, M. David Marks
Trichome Development In Arabidopsis Thaliana. Ii. Lsolation And Complementation Of The Glabrous1 Gene, Patricia L. Herman, M. David Marks
School of Biological Sciences: Faculty Publications
We are using the formation of trichomes in Arabidopsis thaliana as a model system to study gene expression during cellular differentiation. To initiate the molecular characterization of this system, we tagged and isolated a gene that is specifically required for the development of the specialized trichome cell. We confirmed the identity of this gene, GLABROUS1 (GL1), by complementation. These results demonstrate that a crucial gene in a plant developmental pathway can be successfully identified by complementation.