User:Jaster1

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 and Gallifreyans were the first sentient life to form in this universe, as a result their evolutionary pattern created a morphogenetic field that resonated across the universe, making the development of Gallifreyan-like lifeforms far more likely. That made it more probable that the next sentient race to evolve would be physically similar or identical to the Gallifreyan race, and that made it much more likely that the next race would be similar to Gallifreyans, and so on. Many sentient species (such as Humans) are outwardly indistinguishable from Gallifreyans, right down to such morphological minutiae as the same racial phenotypes, hair distribution patterns, fingernails and cartilaginous foldings of the nose and ears. 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 races not identical to them developed under very specific and usually unique environmental conditions. Races that are very disimilar to Gallifreyans developed in environments where two legs, two arms and a head would have been a positive handicap.