They are composed of rRNA and ribosomal proteins. Saccharomyces is a genus of ascomycetes. They are normally diploid unicellular fungi that reproduce asexually by budding. Asci , containing four haploid ascospores , develop directly from the diploid vegetative cells by meiosis . After germination of the ascospores the haploid cells can reproduce vegetatively, or haploid cells of different mating type can fuse to form a diploid zygote .
Most laboratory strains used are, in contrast to wild- type yeasts, stable haploids.
The function of snRNPs is to mediate and regulate post-translational RNA processing events. Solo LTR A solitary LTR sequence lacking a TY element . This indicates that a TY was located in this region. As the remaining LTR has no function anymore, and on the other hand its sequence is well conserved the transposition must have occured in the near past. It mediates the movement of the duplicated chromosomes to opposite poles.