Board Thread:Questions and Answers/@comment-24979796-20141003111126/@comment-5278765-20141005230507

I think that was just meant to be a running joke in the episode, but it was really grating to me after the first time it happened. But it is possible that she does have the Alzheimer's gene. When Bailey mapped Meredith's genome, she said that she tested positive for some of the Alzheimer's markers, but Derek also had markers for baldness and heroin addiction.