Here's a story to take you back to high school biology class.
You may recall that the "Y" chromosome is present in all males. While a lot remains unknown about that gene, a recent study shows that it can be mimicked or replaced. The application of that knowledge could lead to advances in fertility treatments.
A team from the Institute for Biogenesis Research at the John A. Burns School of Medicine spent the last 2 years researching replacements for the Y chromosome.