This question is related to the world from my prior questions, in which several types of intelligent hominids evolved in isolation, until they were rediscovered, conquered, and bred into a biological caste system by a dominant species.
Domesticated animals often have patches of white fur. My dog, for example, has a near perfect star shape right in the center of her chest. This got me thinking about something on different lines:
I'd like it if my noble caste could breed their house servants to have heritable crests. The resulting lineages would then be associated the with other real and imaginary attributes, giving my nobles a jumping off point to trade, sell, and argue obsessively over superior bloodlines and purer stock. Edit: I should make explicit that I would like this to be at least partially delusion on their part; aside from the obvious marker and a few minor physical traits, I'd like mental differences between crest lines to have more social than biological reality.
- Could you breed a hominid to give it a heritable mark, such as a patch of discolored skin or hair, that makes a simple but clean and coherent shape? Edit: Preferably on the chest or forehead. The servants would otherwise be physically distinct, but more like human families than dog breeds.
If the above premise holds I'd also like to know what would happen if you crossed the line of a crested hominid with one bearing a different crest, or no crest at all? Finally, to select for a trait this finely would the breeders require special knowledge of, say, Mendellian genetics or the like? Or could they just apply the methods humans have used since time out of mind?