Multiple choice Double trisomes have a genomic constitution of 2n + 2 2n + 1 + 1 2n + 1 2n - 2 Reveal answer Fill a bubble to check yourself B Correct answer Explanation A double trisome involves two different chromosomes, each present in three copies instead of the normal two copies. This is represented as 2n + 1 + 1, indicating an extra copy of two different chromosomes. A simple trisome would be 2n + 1.