Visual genetic variation/selection program available?

[marwk at levels.unisa.edu.au]

Is there a program available for setting up visually an evolutionary
experiment like the one on a MACINTOSH that has been popularised using
butterflies (or moths?) so that one can select from a collection of
next generations (produced according to predetermined rules of genetic
variation) so that one can easily explain the nature of evolution to
show to questioners of the evolution just how quickly natural selection
can lead to a particular life-form?

I would like it for WINDOWS (or X), and preferably non-commercial.

Thank you.

--
Raymond Kennington                | Act in haste and repent at leisure
                                  | Code too soon and debug forever
University of South Australia     | ....Dale and Lily (I think)
Computer and Information Science  | Knobs, knobs everywhere,
Levels                            |        just vary a knob to think!
Pooraka 5095                      | ....Metamagical Themas, Hofsta"dter
South Australia