2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/120014N--body + hydrodynamical simulations of formation and evolution of galaxy groups in a LambdaCDM cosmology have been performed. The properties of the galaxy populations in 12 groups are here discussed, with focus on the colour-magnitude relation in both normal and fossil groups.Proceedings of the Conference "DEEP06 - At the edge of the Universe", Sintra, 9-13 October 2006; 5 pages, 3 colour figuresAstrophysicstext