At least the following 5 things:
- There are no human races in the sense of biological or genetic divisions within the human species. About 94% of genetic variation between individuals lies within so-called “racial groups” - or rather “groups which are conventionally labeled as races” on spurious grounds (for example on the basis of vague and ambiguous differences in appearances). This means that two Africans may be as genetically different from one another as an African and a European. Continued interbreeding throughout history and the resulting exchange of genetic material has maintained humanity as a single species. There are no clearly divided species of humanity that are biological distinct. Humans aren’t monkeys. The concept of race has no genetic basis and genetics doesn’t provide support for those dividing humanity into different races.
- Even divisions based solely on appearances rather than genetic characteristics are flawed since those appearances show a continuum across individuals rather than a clear division between discrete groups of individuals. There are indeed superficial visual differences between people living in different parts of the world, but those differences are individual gradations on a continuum rather than divisions between groups. If you move towards the equator, skin color darkens because darker skin helps to avoid the cancerogenous effect of the sun entering the atmosphere at a right angle. These superficial differences are not only continuous and gradual rather than discrete; they also have no connection to other, supposed differences such as IQ or morality. Even if IQ and morality are determined by genes – and that’s a big “if” - then there is no reason to believe that the genes that determine these qualities “cooperate” with the genes that determine skin color. Hence no reason to assume a causal link between skin color and intellectual or moral faculties.
- So, even if you manage to divide humanity roughly into groups according to broad ranges of skin color – and provide a category called “mixed” for descendants of two individuals belonging to different groups (“Creoles” for example) or for people belonging to borderline groups (Arabs for example) – nothing useful can be concluded from such a division. There is nothing – no gene, no trait, no color, no moral or intellectual characteristic – that distinguishes all the members of one so-called race from all the members of another so-called race.
- As a result of this, observed inequalities between groups that are wrongfully labeled as racial groups must be the result not of biological inheritance but of differences in education, rights and treatment. Biological or genetic arguments for intellectual or moral differences between races are groundless because the denominator – race – is a fiction.
- The word “race” only has meaning in the sense that it is something some people believe in, talk about and act upon. “Race” is something that exists only in the minds of people. In other words, it’s a social construct. However, a social construct can have real life effects given the fact that people treat other people on the basis of their mistaken ideas about “race”. Likewise, race can be meaningful as a form of self-identification, subjective allegiance and group belonging. But also in this sense, the word race refers to nothing in biology or genetics.