2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49430I review some recent developments in the study of quark flavor distributions in the nucleon, including (i) valence quark distributions and the quark-hadron duality prediction for the x -> 1 d/u ratio (ii) sea quark asymmetries and electromagnetic form factors (iii) strange quarks in the nucleon.12 pages, 6 figures, extended version of talk presented at the Workshop on Exclusive & Semi-Exclusive Processes at High Momentum Transfer, Jefferson Lab, June 1999; minor typos correctedHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentNuclear ExperimentNuclear Theorytext