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Originally Posted by pstinard  Hi, I know that there is a definitive answer for head shape, muzzle length, ear type, and set, but I might have to wait until Monday to find the best answer--I'd like to find a reference that answers all of these questions. In the meantime, here is a link to a National Geographic article which states that about 50 genes determine most of the differences between breeds, and they give a few examples of single gene traits... How to Build a Dog - Pictures, More From National Geographic Magazine |
Ahhh, here is the link to the full text article described by the National Geographic article:
PLOS Biology: A Simple Genetic Architecture Underlies Morphological Variation in Dogs
It will take me a while to digest it, but I'll get back to you with specific answers on muzzles and ears. On my first pass, I saw that one gene determines the difference between floppy and erect ears...