The term race is commonly used to refer to a branch or division of the species possessing genetically transmitted physical traits which distinguish it from other branches or divisions of the same level. Adding to this definition, it will here also be defined as including only those individuals who are capable of reproduction with each other without the loss or significant diminishment or alteration of the racially-distinctive genetic traits of either parent stock. The genetically transmitted traits which distinguish a race from other divisions at the same level (i.e., other races) should not be diminished or lost by reproduction within the race. If racially-distinctive traits are lost or diminished by within-group reproduction then the population group is at a level of division too broad and inclusive to be accurately defined as a race. If it is too narrow to be defined as a species, as it does not include all those populations capable of interbreeding, then it is at a level between race and species, which will here be referred to as a subspecies.