GREY'S ANATOMY - "Can't Fight Biology" - Things are hostile on all fronts when a visit to the obstetrician results in some disturbing news for Meredith and Derek, and Lexie loses it when she notices Meredith and April getting closer. Meanwhile a car crash brings in multiple traumas and Jackson tries using his physical attributes to get ahead in the operating room, while Cristina's self-doubt carries outside of the hospital and into her house hunting with Owen, on "Grey's Anatomy," THURSDAY, OCTOBER 14 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/ADAM TAYLOR) PATRICK DEMPSEY, ELLEN POMPEO