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Due to the inherently nonlinear nature of gravity cosmological N-bodysimulations have become an invaluable tool when the growth of structure isbeing studied and modelled closer to the present epoch. Large simulations withhigh dynamical range have made it possible to model the formation and growth ofcosmic structure with unprecedented accuracy. Moreover, galaxies, the basicbuilding blocks of the Universe, can also be modelled in cosmological context.However, despite all the simulations and successes in recent decades, there arestill many unanswered questions in the field of galaxy formation and evolution.One of the longest standing issue being the significance of the formation placeand thus initial conditions to a galaxy's evolution in respect to environment,often formulated simply as "nature versus nurture" like in human developmentand psychology. Unfortunately, our understanding of galaxy evolution indifferent environments is still limited, albeit, for example, themorphology-density relation has shown that the density of the galaxy's localenvironment can affect its properties. Consequently, the environment shouldplay a role in galaxy evolution, however despite the efforts, the exact role ofthe galaxy's local environment to its evolution remains open. This thesisintroduction discusses briefly the background cosmology, cosmological N-bodysimulations and semi-analytical models. The second part is reserved for groupsof galaxies, whether they are gravitationally bound, and what this may implyfor galaxy evolution. The third part of the thesis concentrates on describingresults of a case study of isolated field elliptical galaxies. The finalchapter discusses another case study of luminous infra-red galaxies.

Properties of Galaxies and Groups: Nature versus Nurture