Male embryos grow faster: Breakthrough study reveals genetic reasons why

Male embryos grow faster: Breakthrough study reveals genetic reasons why

In a quiet lab at Cornell University, scientists have made a discovery that could reshape how we think about life’s earliest stages. Researchers found that male and female embryos begin developing differently just seven to eight days after fertilization. This difference appears before sex hormones like testosterone or estrogen are even present. For decades, scientists knew that male embryos in many mammal species—such as cows, mice, and even hum…