Genetics account for the majority of a person’s height. Studies on fraternal twins show that the biggest factor in determining a person’s body type is heredity. Quite simply, if a person’s parents are tall, it is more likely that the person will also be tall. If a person’s parents are short, it is much more likely that the person will be short as well. Sex is another biologic factor that plays a role in determining a person’s total height. Women tend to have less total height potential than men. Certain medical conditions can also play a role in determining a person’s height.

Maria Sharapova and Ashton Kutcher