Clifford Tabin, a professor in the Department of Genetics at Harvard Medical School and also the chairman of the department, will present the Russell Marker Lectures in Evolutionary Biology on March 14 and 15 on Penn State's University Park campus. The free public lectures are sponsored by the Penn State Eberly College of Science. The series includes a lecture intended for a general audience titled "Revisiting Evolutionary Examples Used by Darwin: New Insights in the Varied Beaks of Darwin's Finches and Regressive Evolution in Cave Fish" at 5 p.m. on Monday, March 14. Tabin also will give a more specialized lecture titled "Evolution and Development of Gut and Limb Pattern" at 4 p.m. on Tuesday, March 15. Both lectures will take place in the Berg Auditorium, 100 Life Sciences Building.