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According to English reproductive biologist Jack Cohen, the typical image of a Grey, given that it would have evolved on a world with different environmental and ecological conditions from Earth, is too physiologically similar to a human to be credible as a representation of an alien. Their physical structure has been sometimes viewed as supporting the Panspermia theory of origins, although the "parallel evolution" required is not scientifically plausible. The "parallel evolution" concept, utilized as a plot device by Star Trek writers Gene Roddenberry and Gene Coon and referred to as "Hodgkins Law of Parallel Planet Development". However, even this fictional theory does not explain such remarkable Grey-human similarities as the facial geometry, the apparent sternal-xiphoidal process, the evident pectoral-trapezial architecture, and the number of toes per foot.[14]

One theory that could explain such seemingly impossible coincidences is the idea that extraterrestrial beings had some influence on the evolution of life on Earth in the distant past, specifically that extraterrestrials were directly involved in the evolution of primates, including humans. This was supposedly done by genetic engineering, cross-breeding, or a combination of both. This idea, regarded as nonsense by the mainstream science community, first gained widespread exposure with the 1968 publication of Chariots of the Gods? by Erich von Däniken and has since been the source of much controversy, and has inspired numerous other books with various related theories.

Proponents of this theory of alien genetic/evolutionary intervention on Earth argue that if the Greys (or similar beings) were performing genetic manipulations and/or experiments with pre-human life forms on Earth, then it would be logical, and perhaps almost expected, that these alleged aliens may have attempted to influence the evolution of life forms here in a direction consistent with their own genetic makeup, and similar to their own physiology and general physical structure, since genetically that is what they would presumably be most familiar with.

Since there is no evidence of what types of life or physiology might evolve on other habitable planets, no way to accurately gauge the likelihood or unlikelihood of coincidences in evolution on two separate planets, and no conclusive evidence of any alleged past extraterrestrial genetic manipulation in our own evolution, the debate over the evolutionary feasibility of the Greys (or any other bipedal, humanoid extraterrestrial species) is ultimately nothing more than speculation on both sides.

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