WRAPUP 1-Obama to choose Yellen for top Fed job, markets relieved

* Yellen would be first woman to head U.S. central bank * Monetary dove would provide policy continuity after Bernanke * Expected to win Senate approval despite some Republican qualms By Mark Felsenthal and Jeff Mason WASHINGTON, Oct 9 (Reuters) - U.S. President Barack Obama will nominate Federal Reserve Vice Chair Janet Yellen on Wednesday to run the world's most influential central bank, providing some relief to markets that would expect her to tread carefully in winding down