Mocca Man is Impossible, Human Bio-Diversity is Guaranteed to Increase Exponentially - Politics Forum.org | PoFo

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It is not a common idea but there are some who hope for no good reason that human diversity will reverse to the point of becoming completely homogeneous. They imagine "white", "black", "red", "yellow", "olive", "brown" etc will all get smudged together to create a single homogeneous race with skin the colour of a Mocca cup of coffee. They imagine this will happen due to what some people call "miscegenation". However, hilariously, miscegenation has the exact opposite effect because no mixing can ever be perfect and so will always result in more diversity not less. If you mix black with white for example you do not get brown, 2 into 1, what you get is black, white, dark brown, medium brown, light brown etc, 2 into infinite shading. More variety not less. The proper term for "miscenation" is hybridisation and it is a powerful cause of genetic and phenotypic diversity both for humans and other species.

Another powerful driver of genetic heterogeneity is selection to fit diverse environmental conditions. Our planet earth has a pretty diverse environment and this has shaped a lot of human evolution but some may say that as we increasingly live in artificial environments rather than natural environments which all tend to be rather similar then that may have a small convergence effect but even if true it will be shortlived as humans expand beyond earth because the environmental diversity of earth is a very narrow range compared with the worlds we may inhabit in the future.

Then of course personal genetic tailoring in the near future will allow people to quite dramatically alter genetic and phenotypic traits. Since this will be done on a individual level and might include splicing in even non-human genes we can expect this ability to vastly expand human bio-diversity. There will be as many "races" as there are individuals.

Diversity is also factored by overall population size, the bigger the population then, all else being equal, the more genetic variety. Homo Sapiens could have a serious population reversal but only a apocalyptic catastrophe could really cause that at which point worrying about the homogeneity of homo sapiens (and offshoots) is rather beside concern. In the absence of an apocalypse the human population is virtually guaranteed to continue exponentially growing as our technology opens up new worlds and resources both on and beyond earth.

Genetic isolation is what actually drives homogeneity but that cannot work across the whole species only for small clusters of it and in the long run this cements into speciesation which arguably is a net increase in diversity.
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