Final answer:
The reference provided about Ethel Calderwood and Bobby Rosenfeld does not answer the question about Joe Rantz's gold medal; his medal's specifics after the 1936 Olympics are not well-documented.
Step-by-step explanation:
The question regarding what happened to Joe Rantz's gold medal refers to an event in history, specifically relating to Olympic history. However, the provided reference information about great female athletes like Ethel Calderwood and Bobby Rosenfeld winning Olympic gold medals for Canada is not directly related to Joe Rantz, and therefore does not answer the student's question.
Research about Joe Rantz, who was a member of the 1936 U.S. men's rowing team, indicates that his gold medal is not widely reported on for any particular event post-Olympics. Without further information, a precise answer about what happened to his gold medal cannot be provided.
Joe Rantz was an American rower who competed in the 1936 Olympics, and he won a gold medal in Men's Eight rowing event. After the Olympics, Rantz sold his gold medal due to financial difficulties.
It's worth mentioning that in the 1928 Olympics, Ethel Calderwood and Bobby Rosenfeld, both Canadian athletes, won Olympic gold medals in track and field events.