We introduced the term "hybrid" into the NPA model because, according to the model, parental non-sanguine types and non-aggressive types would be partially infertile (the hybrid progeny would be either non-viable P or null types, or viable NPA+ and NA types). Hence, the two parental non-sanguine and non-aggressive types could be considered to be separate subspecies, since if pure bred, they would be complete infertile if crossed (all of the progeny would be non-viable P or null types).
In the case of the Australian Aborigines, the parental types were different in physical characteristics and geographically separated (gracile, darker skinned NP types of the Top End vs. NA types of the central deserts). Thus, the NPA+ and N types in the intermediate areas were likely "hybrids" of the parental types (not present in either parental group) and not separate tribes that migrated to those regions from elsewhere.
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