Hi, and thank you for coming to JustAnswer.com with your question.
The quick answer is that the genetics of various disease of the heart and blood vessels can be passed along. This means that you should be followed by a doctor specifically for this purpose.
If your mother had high cholesterol levels then that could have led to her MI. This can be a guide to you to make sure your cholesterol levels are in the good range.
Basically, there are a lot of things that contribute to MI, some are things we can control, some are things we can't.