This essay discusses the research into anxiety disorders. The study under examination does research with same-sexed twins. The authors look into genetic factors in the creation of anxiety disorders. They do this in a study of 32 monozygotic (MZ) and 53 dizygotic (DZ) adult same-sexed twins. In their study, the frequency of anxiety disorders turned out to be higher in MZ than in DZ twins. 4 pgs. Bibliography lists 1 source.