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Orign of the gallifreyanoid form
Morphogenetic fields are an interesting, but obscure offshoot of biology. All living beings have a field associated with them which defines their entire biology, just as an electric field defines an electron. The morphogenetic fields provide a force that guides the development of an organism as it grows, making it take on a form similar to that of others in its species. DNA is not the source of structure itself, but rather a 'receiver' that translates instructions in the field into physical form. The morphogenetic fields are reinforced by every successive generation. That is why there are so many gallifreyanoid species in the universe. Gallifreyans were the first sentient life to evolve in this universe, and thus created a morphogenetic field of their external physical form. That morphogenetic field resonated across the universe, making gallifreyanoid lifeforms far more likely to evolve via parallel evolution. That in turn, made it more probable that the next sentient race to evolve would be gallifreyanoid, and that made it much more likely that the next race would be gallifreyanoid. Many gallifreyanoid species (e.g. Humans) are outwardly indistinguishable from Gallifreyans. The reason they are so astonishingly similar to the Gallifreyan race is because the Gallifreyan form represents the basic way that evolution most likely takes for the dominant mammalian race on an average Gallifrey-like planet under the influence of the Gallifreyan morphogenetic field and the gallifreyanoid races similar but not identical to them developed under very specific and usually unique environmental conditions. The majority of the races not gallifreyanoid at all developed in environments where two legs, two arms and a head would have been a positive handicap.