  Recombination is introduced into Eigen's theory of quasispecies evolution.
Comparing numerical simulations of the rate equations in the non-recombining
and recombining cases show that recombination has a strong effect on the error
threshold and, for a wide range of mutation rates, gives rise to two stable
fixed points in the dynamics. This bi-stability results in the existence of two
error thresholds. We prove that, under some assumptions on the fitness
landscape but for general crossover probability, a fixed point localized about
the sequence with superior fitness is globally stable for low mutation rates.
