To answer this question properly, we need to understand what the scientist is using as an example to support their educated guess.

Here are some possibilities, depending on what the missing information is:

Possibility 1: The scientist is giving an example of a specific genetic factor they believe is linked to diabetes.

* Example: The scientist could point to the Tcf7L2 gene, which has been strongly linked to an increased risk of type 2 diabetes. They could explain how variations in this gene might affect insulin sensitivity and ultimately lead to diabetes.

Possibility 2: The scientist is giving an example of a study or observation that supports the idea of a genetic link to diabetes.

* Example: The scientist could cite a study showing that identical twins have a higher concordance rate for diabetes than fraternal twins, suggesting a strong genetic component.

Possibility 3: The scientist is giving an example of a family history of diabetes in a particular family.

* Example: The scientist could discuss a family where multiple generations have been diagnosed with diabetes, suggesting a possible inherited predisposition.

To give you a more specific answer, please provide the missing information about what the scientist's example is about.