sex chromosomes

Scientists have discovered the oldest known sex chromosomes in octopuses and squids from 455 million to 248 million years ago - 180 million years earlier than the previous record.

Researchers at the University of Minnesota Medical University and the University of Biological Sciences have made an important discovery indicating that male sex must be maintained

Forget about the Y chromosome - it's time to talk about the X chromosome.

166 million years ago, when the first mammals appeared,