Figure 1.—

Determinist dynamics of a mobility mutant. A functional element (u = 0.015, v = 0.001, a = 1, s = −0.01) is introduced at the first generation with an average of 1 copy per individual. After 2000 generations, when the copy number is stabilized (transposition–selection equilibrium), a mutant copy with the same features except for u is introduced (five copies in all individuals, to make the plots more easily readable). (a) If the mobility of the mutant is lower than that of the wild element (u = 0.014), the mutant will be eliminated. (b) If the mutant has a better mobility (u = 0.016), it will progressively invade the population.