that every site in the amiR - target sequence of the viral genome presented variation
In this system , viral evolution in fully susceptible plants results from an equilibrium between mutation and genetic drift ,
We found that every site in the amiR - target sequence of the viral genome presented variation and that the variant that eventually broke resistance was sampled among the many coexisting ones .
In this system , viral evolution in fully susceptible plants results from an equilibrium between mutation and genetic drift , whereas evolution in partially resistant plants originates from more complex dynamics involving mutation , selection , and drift .