Question

is this a run - on sentence? right - handedness is controlled by genetics, interestingly enough, the same genes are also responsible for the brain becoming more specialized at certain tasks.

Explanation:

A run - on sentence occurs when two or more independent clauses are joined without proper punctuation or conjunctions. The given sentence has multiple independent - clause - like parts ("Right - handedness is controlled by genetics", "interestingly enough, the same genes are also responsible for the brain becoming more specialized at certain tasks") joined without proper separation.

Answer:

yes