2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10129We test the hypothesis that elliptical galaxies are formed by violent mergers in a universe with hierarchical structure formation. Within the framework of a semi-analytic scheme for galaxy formation, we predict the distribution of morphological types with redshift and compare the colours of elliptical galaxies in different environments.4 pages of uuencoded compressed PostScript; to appear in the proceedings of the 11th IAP meeting, "The interplay between massive star formation, the ISM and galaxy evolution"Astrophysicstext