What are the genetics behind dorsal humps?

   The development of the dorsal hump is more complicated than what you suggest as is the overall character of the hump, the percentage of cartilage and bone involved, etc.Kenneth Hughes, MDLos Angeles, CA

Our facial features are based on genetics. Much of what we look like comes from our parents, and their genes of course. However, as we grow, external factors can also influence nasal anatomy. Trauma such as a broken nose or even severe trauma without a fracture if at a crucial growth time can result in a nasal hump. Nasal architecture (as well as chin shape) may even be influenced by airflow problems as a child such as enlarged adenoids.

I am not aware that the science of genetics has evolved to the point of identifying a loci on gene that is specific for a facial feature like a nasal hump. It clearly is genetically inherited as almost all facial features are but whether the it is a recessive or dominant trait is new information for me.

I never heard the genetics as you described it. It really is multifactorial and it is hard to predict if someone will have a dorsal hump or not.

Look at your parents and your grandparents and your cousins etc. That is where noses and other facial features come from. Also, if you have a hump and want to get rid of it, it doesn't matter if it is genetic or traumatic.