Ribosomal RNA genes specific to the B chromosomes in Brachycome dichromosomatica are not transcribed. The three style forms found in Oxalis spp. Studies carried out during the last decade have contributed to the understanding of flower development. Many genes which appear to belong to a large family of regulatory genes are involved. These genes appear to share an evolutionary history in various groups of plants.
Several mechanisms enable the stigma to disriminate between pollen of different types.
The best studied is self-incompatibility. The molecules that regulate self-incompatibility are currently well characterised in only six plant families. This work aims to characterise those involved in the control of self-incompatibility in Oxalis spp. The genetic knowledge of this system will enable an immediate correlation of genes with new molecular evidence and contribute further information about the molecules that control self-incompatibility in a novel system of cross pollination. Simulations for teaching population genetics Population genetics, because of its mathematical complexity, has always been an area that is difficult to teach to students whose primary interest is biological.