If I have a genetic marker (change/variant/mutation) for a certain gene, does that mean that I will definitely have that trait?

No. Contrary to popular belief, you are not your genes alone. If you have a genetic change for the markers that GoalGetter looks at, it affects your potential to have a certain trait. This statement in the Your Genetic Story PDF sums it up very well: "As you learn about your genetic potential, it's important to keep in mind that your genes alone typically have a very small impact, especially compared to the interaction between your genes and environment. The choices that you make for nutrition, lifestyle, and exercise have a large impact, and are critical to revealing your body's potential." GoalGetter is here to help you learn about your genetic potential and make positive choices for diet, lifestyle and exercise.