No, AFAIK only the Tin-Borns get a phenotype other than normal human (which is a phenotype, just a basic one). If your GM is very generous then you might be allowed a different phenotype for other reasons - one could argue that a character like Kai Allard Liao, for example, should be treated as a clan MechWarrior for character creation. Just a random abberation amongst the trillions of people in the IS that resulted in genes good for piloting a 'Mech. Less random if he's from a long line of successful MechWarriors on both sides of the tree, that's a form of eugenics in and of itself.
- Shane