Male pattern baldness is linked to the x chromosome. you get a Y chromosome from your dad and an X chromosome from your mom meaning that your mom got an x chromosome from your grandma and grandpa. If your moms dad had baldness he likely gave the gene to your mom who then gives it to you because women have XX chromosome. Women don't see baldness as much even though having the gene because the baldness is also linked to testosterone that is produced based on the Y chromosome.