This is partly true. Genetics is the most common cause of hair loss, but finding out what’s happening is the most important step toward deciding what to do about it. Here’s the scientific explanation. Research suggests that men who have a bald father are more likely to develop male pattern baldness than those who do not. The hereditary pattern is polygenetic, but the most important gene determining baldness is on the X chromosome. Men have only one X chromosome, which is from the mother. However, other factors are also involved. Epigenetics are important in controlling gene expression.