I have a feeling that every one is agreeing on the word race, but differ and argue when it comes to its meaningful application. I agree there is only one race - a human race. But then come sub classifications which can be in form of skin colour which then may be further classified on geo-biological forms; the white of Greece are different then the whites of say German race or the Aboriginal blacks are different from the African blacks, for instance. Fact, nevertheless, remains that all of these sub-classification remains under same genetic format “human race”. Thus if two matching reproductive meet within the same genetic format they will result into a productive outcome. Having said that, it is also a fact that each sub classification has its own virtues/faculties, so when different sub classified races “meet” the “purity” of each sub-classified race is lost, and is replaced by a unique blend of the faculties of those two distinguished sub-classified genes/races.
In the animal kingdom, zoos around the world has in principle decided to keep the nature in its purest form, so even if there are two similar animals (say lion or a tiger race), through investigation is done (some times to the tenth predecessor on family tree) to ensure that when breeding program is planned, exact match is there to ensure nature remains in its purest form, that is if it is a lion, it must be from the same very species background. In a more distinguishable example, let me say either a lion or a tiger. Out of the World Zoos authorities, private owners have mixed tigers and lion to derive ligress. Ligress is neither a tiger not a lion, so at its best we can say another animal sub species from amongst the big cat race; it has its own faculties that are different from that of a pure tiger or a lion. Mixed races are not what ideally nature had intended, nevertheless still remains within the extended boundaries, or say acceptable limits of the nature. Similarly within humans if two different sub-races will “meet”, the result will be a blend, which would be though within the macro human race but uniquely different then the sub-classified original races. Coming to the point, all I will say is that race and sub classified races remain a fact, those who deny …. Well, let me say that they have the right to their opinion...! However, having said that, I would sure distinguish between race and racism, both are undeniable facts. The first (race) generated by nature, the second generated by humans – the first, for me is better then the second! To me my first preference would be to have a blend of fruits – that is a fruit salad, which is at its best when each different fruit item is distinguishable so not only to give best unique flavour, but also to match with visual delight; mashed them and I may loose my appetite. But then I also nourish some time, YES some times, a blend of different fruit juices, for instance a touch of carrot in apple juice, which add both to the flavour as well as nourishment, and is not too bad!!