Somebody once posted a thread requesting this gene be added to the game. It makes an Adult T-Rex but it's a little smaller than a regular T-Rex.
Okay. I don't know about everyone else but me. I have this T-Rex pack on Isla Nublar sandbox mode and I named them after myself and my fellow Rockstars (Carly Rae Jepsen, Todd Ingram and Envy Adams) and I want to Lil Sweet from the Dr. Pepper commercials to the group in the form of a dwarf T-Rex.