Our work in strawberry sex chromosome evolution represents an extremely successful collaboration with Dr. Tia-Lynn Ashman at the University of Pittsburgh. We previously documented three distinct locations of the sex determining region (SDR) in octoploid strawberry. We then discovered a single origin of this SDR, and subsequent transposition and expansion (Tennessen et al 2018). Our current NSF grant aims to examine the impacts of this movement on sexual dimorphism, and to test different hypotheses for its cause.