<P> When the chief of surgery, Richard Webber (James Pickens Jr .)'s wife, Adele, is diagnosed with Alzheimer's, she receives a spot on the trial . Meredith tampers with the drugs so that Adele does not receive the placebo . She and Derek decide to adopt Zola, an orphaned baby from Malawi, and make their marriage legal . When the truth about the tampering comes out, however, a furious Derek tells her he cannot raise a child with her because of her moral ambiguity . Meredith is fired, and tries to conceal both this and her marital separation from the adoption counselor in order to keep Zola . Although Dr. Webber steps down as chief of surgery and takes the blame for the trial tampering to protect Meredith, Zola is taken away . She and Derek reconcile . Meredith chooses a general specialty over neuro, and they successfully fight to get Zola back . </P> <P> As her last year of residency is coming to a close, the residents travel around the country, searching for the best jobs in their specialties . In order to finish their residency, the residents must take the medical boards . Meredith takes the exam while sick with the flu . She decides to take a job offer at The Brigham and Women's Hospital as the next step in her career . During a medical flight to undertake a prestigious surgery involving conjoined twins, Meredith, Derek, Cristina, and Lexie, among others, are involved in an aviation accident . The plane crash kills Lexie, and the survivors are trapped in the wooded wilderness for days waiting for help . Following their rescue, Merdith becomes an attending general surgeon at Seattle Grace, now Seattle Grace - Mercy West . While Cristina flees Seattle for her fellowship, Meredith, afraid of flying and change, declines her job offer, and clings to what remains in Seattle . Cristina and Meredith begin calling the hospital Seattle Grace Mercy Death in light of the immense amount of trauma, death, and pain they have experienced there . </P> <P> Meredith's newfound attitude and sarcasm leads to her being dubbed "Medusa" by the hospital's new batch of interns . In the aftermath of the plane accident, the hospital is sued and eventually found guilty of negligence . Each victim including Derek, Cristina, Arizona Robbins (Jessica Capshaw) and herself must receive $15 million of compensation, which leads the hospital to a near bankruptcy as the insurance company refuses to pay due to a loophole . The doctors along with Callie Torres (Sara Ramirez) buy the hospital with the help of the Harper Avery Foundation to prevent it from closing and become new members of the directing board . </P> <P> Meredith asks Dr. Bailey to perform gene mapping on her to finally know whether she has Alzheimer's genes like her mother . She tests positive for more than one of the genetic markers for the disease . </P>

When do derek and meredith have a baby