Taylor, P.J., Kumirai, A., Contrafatto, G.-C. 2004. Geometric morphometric analysis of adaptive cranial evolution in southern African laminate-toothed rats (Family: Muridae, Tribe: Otomyini). Durban Museum Novitates 29: 110-122. Geometric morphometric analysis of cranial shape and size variation was carried out on laminate-toothed rats (Rodentia: Muridae: Otomyini) from southern Africa, to inve...

BACKGROUND The common stinging nettle, Urtica dioica L. sensu lato, is an invertebrate "superhost", its clonal patches maintaining large populations of insects and molluscs. It is extremely widespread in Europe and highly variable, and two ploidy levels (diploid and tetraploid) are known. However, geographical patterns in cytotype variation require further study. NEW INFORMATION We assembled ...

The transposition of P elements in Drosophila melanogaster is regulated by products encoded by the P elements themselves. The P cytotype, which represses transposition and associated phenomena, exhibits both a maternal effect and maternal inheritance. The genetic and molecular mechanisms of this regulation are complex and not yet fully understood. In a previous study, using P-lacZ fusion genes,...

Genome duplication (or polyploidization) has occurred throughout plant evolutionary history and is thought to have driven the adaptive radiation of plants. We found that the cytotype of the root, and not the genotype, determined the majority of heritable natural variation in leaf potassium (K) concentration in Arabidopsis thaliana. Autopolyploidy also provided resistance to salinity and may rep...

Pteris vittata L. is very common and a widely distributed species belongs to the family Pteridaceae. Various cytotypes from diploid octaploid available in this fern species. The present work has been carried out for genetic diversity both within between cytotypes. molecular analysis at inter- as well intra-species with 57 accessions of P. other Microsorium punctatum considered an group taxon. F...

P strains of Drosophila are distinguished from M strains by having P elements in their genomes and also by having the P cytotype, a maternally inherited condition that strongly represses P-element-induced hybrid dysgenesis. The P cytotype is associated with P elements inserted near the left telomere of the X chromosome. Repression by the telomeric P elements TP5 and TP6 is significantly enhance...

Mobile P elements in Drosophila melanogaster cause hybrid dysgenesis if their mobility is not repressed. One type of repression, termed P cytotype, is a complex interaction between chromosomes carrying P elements and cytoplasm and is transmitted through the cytoplasm only of females. Another type of repression is found in worldwide M' strains that contain approximately 30 copies per individual ...

P elements inserted near the left telomere of the X chromosome are associated with the P cytotype, a maternally transmitted condition that strongly regulates the activity of the P transposon family in some strains of Drosophila. The regulatory abilities of two such elements, TP5 and TP6, are stable in homozygous stocks over many generations. However, these regulatory abilities are attenuated wh...