Pure Blood
A "Pure Blood" used to insinuate an entirely draconic blood line in which there is no human blood nor any different color or type. It then came to describe just an all dragon blood line. However, these no longer are common and so the term has come to mean a dragon child in which both the father and the mother are dragons.
Half Breed: Active
An active half breed is a dragon with a draconic parent and a human parent, where the draconic half is active and the human half is dormant. Their genes work as any other dragon.
Half Breed: Dormant
Also known as "Sleepers," these half breeds are quite a bit different than active half breeds, because their human halves take over their dragon halves. They will always have a few draconic characteristics, such as a different body temperature, and a keen ability to communicate without using words.
Half Breed Mutants
A mutant is a humanoid child with physical draconic features, making it impossible for them to function in normal human or dragon societies. These children used to be drowned or burned at birth, but that's not exactly considered "humane" anymore.
Dragon Descendant
Also known as "Droplings" due to the fact that these humans have a drop of dragon blood from more than ten generations back. Only once ever fifty generations through the female line (if the dragon was female) or through the male line (if the dragon was male) do these droplings show draconic abilities, such as the use of mindspeak, deadly accurate aim, a difference in their temperatures and the ability to lead packs.