Figure 1From: Evolution of variation in presence and absence of genes in bacterial pathwaysStructure of the model. Structure of the model for the case n = 5. Variables x i in the circles represent the proportion of the population carrying i genes of the 5-gene pathway in a genome. Horizontal arrows to the left indicate the effects of deletions. Curved arrows to the right show the effect of horizontal transfer. Fitnesses are depicted by arrows below populations.Back to article page