The Genetic Xenomorphs are a mutated strain of Xenomorph Drone that was spawned by the Queen extracted from the cloned Ellen Ripley, Ripley 8, on board the USM Auriga. The cloning process used to acquire Ripley 8 and, subsequently, the Xenomorphs resulted in the Queen and its Drones becoming altered through the unintentional inclusion of human DNA.
As with other Drones, the Genetic Xenomorphs are capable of spitting acid. They are typically 7 feet tall when standing upright. The Genetic Xenomorphs' first (and, to date, only) appearance was in Alien Resurrection.
At a distance, Genetic Xenomorphs bear a strong resemblance to normal human-spawned Xenomorphs, but upon closer inspection they possess several unique differences resulting from their contaminated DNA. Most obviously, their skin has a distinct shimmering green hue not seen on any other Aliens, making them more insect-like in appearance. Their necks are much fleshier than the biomechanical design seen in normal Xenomorphs, a change that may relate to their ability to roar in a fashion not seen with other Aliens. Their bodies also adopt a partially quadripedal stance like that of the Runner, with digitigrade hind legs, rather than the primarily bipedal posture of other human-spawned Xenomorphs. Their tails have flat ridge of spines at the base of the blade, making them excellent swimmers. Like other Drones, they have smooth skulls.
The Genetic Xenomorphs show strength comparable to other human-spawned Aliens, being capable of battering down steel doors and tearing open metal grates and floors with their bare hands. They can spit acid, often aiming for a victim's face to blind and subdue them. They also possess heightened agility, with some even seen to dodge incoming weapons fire.
The Genetic Xenomorphs are shown to be more aggressive than normal Xenomorphs and significantly more intelligent too, displaying impressive problem solving skills and the ability to learn rapidly and even set traps to lure and ambush victims. The Genetic Xenomorphs were first able to escape their containment cells on board the Auriga by killing one of their own and using the effects of the dead creature's acidic blood to melt through the enclosure's floor and allow the others egress. Similarly, a Drone was shown to learn almost immediately that disobedience would result in punishment in the form of a freezing nitrogen spray, and later used the same spray to eliminate military personnel searching for it.
The Genetic Xenomorphs are not a naturally-occurring strain, and were artificially created through genetic engineering. Following the events on Fiorina 161, blood samples of the deceased Ellen Ripley were collected from the planet and used as the starting point in an ambitious program to clone Ripley and, it was hoped, the embryo of the Xenomorph Queen that had been growing inside her at the time of her death. After 200 years and 7 failures that only resulted in the creation of horrifically deformed mutants, the program apparently succeeded and the Queen embryo was harvested by United Systems Military scientists aboard the Auriga.
However, the cloning process had not been a perfect success, and unbeknownst to the scientists the DNA of the Xenomorphs and Ellen Ripley had become mixed in the process, endowing both the Ripley clone and the Queen with anomalous traits and abilities, traits that were passed on by the Queen to her offspring, resulting in the Genetic Xenomorphs.