Table 2.

Variability level of the sites in which polymorphisms are found in rRNA genes

^aVariability “bins” are those from the LSU and SSU rRNA variability maps in Ben Ali et al. (1999) and Van de Peer et al. (1997), respectively. Red are the most variable, and purple the most highly conserved sites (Van de Peer et al. 1996.

^bIncludes all polymorphisms in the 18S, 28S, and 5.8S rRNA genes from all five species pooled together. Complex mutations (involving more than three nucleotides) and insertions were not included. Only high-confidence polymorphisms were used.

^cPercent of rRNA gene nucleotides expected for this sample size in each variability “bin,” calculated by summing all nucleotides found in each “bin” from the LSU and SSU gene variability maps of Saccharomyces cerevisiae. The observed numbers are not significantly different from the expected using the χ² test (P > 0.95).