  We evaluate the constraints that the COBE observations put on baryogenesis in
inflationary cosmologies.We consider the supersymmetric version of the proposal
of Fukugita and Yanagida, that the baryon asymmetry of the universe is created
by nonperturbative electroweak reprocessing of a lepton asymmetry generated in
the decay of heavy right-handed see-saw (s)neutrinos. We review our recent
proposal of a mechanism for baryogenesis via sphaleron reprocessing of a lepton
asymmetry generated by (s)neutrino mass effects on flat direction scalar
condensate oscillations. Finally we analyze in detail the implementation of
these mechanisms in the recently proposed ansatze for fermion mass matrices in
supersymmetric, unified, theories.
