New scientific discoveries about x and y chromosomes are challenging what we know about what makes us male or female. Maria Armoudian discusses these discoveries with Jeremy Nathans and Melissa Wilson Sayres.

Jeremy Nathans is a Professor of Molecular Biology and Genetics at the Johns Hopkins University School of Medicine. His work has changed our understanding of how humans see the world. For more on his work, please visit his website here.

Melissa Wilson Sayres is a Professor in the School of Life Sciences and The Biodesign Institute at Arizona State University. Her research interests include sex chromosome evolution, sex-biased processes, population genetics, and comparative genomics. For more on her work, please click here.

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