So races don't exist. Can we say niggers are an awful Deme? https:// en.wikipedia.org/wiki/Deme_(biology)
We have two copies of each gene. If one gene codifies for a faulty protein, there is a backup that will hopefully codify for a protein that works.
That means the more variety between the parents, the more the child is likely to get two different versions of a gene, so he’s more likely to get at least one that works.
In the case of a child born from a union with a close relative, say a first cousin, he’s more likely to get two copies of any faulty gene that runs in the family.
So, diversity = health.
Funnily enough, humankind is stuck on this idiotic idea of humans having “races” (nope, homo sapiens doesn’t have races), so some people have this concept that “race mixing” is bad.
In reality, genetically speaking, having children with a person that has got as different as possible genetic makeup from yourself is good, because you decrease the likelihood of your child having two copies of a faulty gene.
Footnotes
Races may exist in humans in a cultural sense, but biological concepts of race are needed to access their reality in a non-species-specific manner and to see if cultural categories correspond to biological categories within humans.
Modern biological concepts of race can be implemented objectively with molecular genetic data through hypothesis-testing. Genetic data sets are used to see if biological races exist in humans and in our closest evolutionary relative, the chimpanzee.
Using the two most commonly used biological concepts of race, chimpanzees are indeed subdivided into races but humans are not. Adaptive traits, such as skin color, have frequently been used to define races in humans, but such adaptive traits reflect the underlying environmental factor to which they are adaptive and not overall genetic differentiation, and different adaptive traits define discordant groups.
There are no objective criteria for choosing one adaptive trait over another to define race. As a consequence, adaptive traits do not define races in humans. Much of the recent scientific literature on human evolution portrays human populations as separate branches on an evolutionary tree. A tree-like structure among humans has been falsified whenever tested, so this practice is scientifically indefensible. It is also socially irresponsible as these pictorial representations of human evolution have more impact on the general public than nuanced phrases in the text of a scientific paper. Humans have much genetic diversity, but the vast majority of this diversity reflects individual uniqueness and not race.
https:// www.ncbi.nlm.nih.gov/pmc/articles/PMC3737365/ Biological Races in Humans
https:// www.ncbi.nlm.nih.gov/pmc/articles/PMC3051415/ Evaluating Self-declared Ancestry of U.S. Americans with Autosomal, Y-chromosomal and Mitochondrial DNA