A national sorority has announced that its Harvard University chapter will close, in what appears to be the first dissolution of a student organization in response to the Ivy League school’s adoption two years ago of penalties for members of single-gender student clubs. The Zeta Phi-Cambridge Area chapter of the Delta Gamma organization voted in May to relinquish its charter, and after a 60-day comment period, leaders of the national organization voted unanimously to close the chapter, according to a statement. A Delta Gamma spokeswoman and leaders of the Harvard chapter could not be reached for comment Sunday evening. The...