The chromosomes that demonstrate the sex of a human are XX and XY. Indeed, we get one of each from our parents. Women can only pass on the X chromosome, while it's male sperm that determines whether a baby will be of female sex (X) or male sex (Y). So what happens if the Y chromosome is in decline? Does it mean there will be less men on the planet, and does this have implications for our species and its survival?
Curious? Click on to learn more about what could happen if the Y chromosome is no more.