Model of population evolution with and without eugenics

We propose, and solve via Monte-Carlo simulation, a model describing evolut ion of population subject to harmful mutations. The habitat changes periodi cally. The evolution of two, initially identical, populations is compared. One without any external ingerence and the second in which we eliminate all individuals which are ill-fitted to the changed environment (eugenics). We show that although in the short run the individuals in the latter are bett er adapted and live longer, after some more changes of the environment, the populations with eugenics become extinct, while the others live on.