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We propose a model based on the gauge group $SU(4)\times SU(2)_L\timesSU(2)_R$ where the Dirac masses of all the known fermions are generated asone-loop radiative corrections. We are able to generate realistic quark andlepton masses and mixings without a large hierarchy of Yukawa couplings orextra symmetries. The neutrino masses, which are see-saw suppressed, lie in themass range favored to solve the solar neutrino problem. The importance ofthreshold corrections to tree-level mass relations in certainnon-supersymmetric GUTs is demonstrated.Comment: 23 pages, Latex. 3 figures submitted as a uuencoded file. One figure  contributing to neutrino mass added changing neutrino mass results. Minor  mistakes and typos corrected; numerical example changed to reflect  correction

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Radiatively generated fermion masses in SU(4)×SU(2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi mathvariant="italic">L</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>×SU(2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi mathvariant="italic">R</mml:mi></mml:mrow></mml:msub></mml:mrow></…

Radiatively generated fermion masses in SU(4)×SU(2)L×SU(2)R