Dr. Mike Weiss

A photo of a bottle of Depo-testosterone.
Wikimedia Commons

How do embryos know how to become male or female? Prof. Mike Weiss, chair of the Department of Biochemistry and Molecular Biology at Indiana University, is studying how one protein, known as the sex-determining protein Y, or “SRY,” can program gender.

“SRY is like the light switch. The bulb is this downstream developmental pathway that leads to the formation of the organs,” Weiss said.