  We build upon the recent steady-state Penna model solution, Phys.Rev.Lett.
89, 288103 (2002), to study the population dynamics within the Penna model. We
show, that any perturbation to the population can be broken into a collection
of modes each of which decay exponentially with its respective time constant.
The long time behaviour of population is therefore likely to be dominated by
the modes with the largest time constants. We confirm our analytical approach
with simulation data.
