Figure 1.
Life cycle of a Ceratocystis species.
Shown here for this typical ascomycete includes both sexual (meiotic) and asexual (mitotic) cycles. In this case both the meiotic and mitotic states occur in a single haploid culture, a condition known as homothallism in fungi.
Figure 2.
Diagrammatic representation of the methodology employed in the experimental design.
The fungus Ceratocystis manginecans, isolate CMW 17568 was derived from single meiospores (ascospores) to generate the meiotic progeny, and the four sequential single hyphal tip isolations generated the mitotic generations of the fungus.
Table 1.
Summary of Chi-Square values across the replica tests for the respective isolatesa.
Table 2.
Combined Chi-Square value statistics across all replicas for meiosisa.
Table 3.
Combined Chi-Square value statistics across all replicas for mitosisa.
Figure 3.
Diagram illustrating a proposed model of concerted evolution in Ceratocystis manginecans.
Concerted evolution is seen as a result of both gene conversion and unequal crossing over occurring during both the meiotic and mitotic life cycles of Ceratocystis manginecans on a hypothetical chromosome which contain both ITS type Z and Y sequences. Yellow circles represent ITS type Z sequence repeat units whilst blue circles represent ITS type Y sequence repeat units. Crossing over (broken red lines) is shown hypothetically as reciprocal recombination (3A) or nonreciprocal recombination (3B) events, in each case the repeat units are subjected to gain and loss events which can result in Gene conversion (solid red line). The broken green arrows indicate multiple unequal crossing events.