Using murine (T,G)-A--L-reactive T cell clones, we have demonstrated the existence of unique homozygous antigen-presenting determinants expressed on C57bl/6 mice, controlled by the I-A subregion of the murine major histocompatibility complex (MHC), which are not expressed on semisyngeneic (C57Bl/6 x A/J)F1 [(B6A)F1] cells. Additionally, we were able to demonstrate that there exist (T,G)-A--L-re...

The role of pollinators in plant speciation and maintenance of species boundaries is dubious because most plant species are visited by several types of pollinators, and most pollinator species visit several species of plants. We investigated pollinator preferences and their efficacy as ethological isolation mechanisms between two interfertile species, Nicotiana alata and N. forgetiana and their...

The identification of parental inbred lines to develop superior hybrids is a rather costly and time-consuming step in maize breeding. In some cases, pedigree information has been used to select diverse parental lines. In the case of Iranian maize inbred lines, this information is not fully available. In this study we investigated the genetic distance (GD) based on Simple sequence Repeats (SSR) ...

Studies from a wide diversity of taxa have shown a negative relationship between genetic compatibility and the divergence time of hybridizing genomes. Theory predicts the main breakdown of fitness to happen after the F1 hybrid generation, when heterosis subsides and recessive allelic (Dobzhansky-Muller) incompatibilities are increasingly unmasked. We measured the fitness of F2 hybrids of Africa...