Originally posted by Palynka
In case you didn't notice, there is also no such thing as a biological understanding of ethnicity.
You can still use race in the social understanding of the word.
There is a biological understanding of something almost equivalent to race and ethnicity. There are specific differences genetically between people of different races or ethnic backgrounds. There are known medical trends and even medicines which are known to work better with specific races. As I said before, what we could call biological race or ethnicity might not however match exactly the common social groupings, and obviously in a racist environment where everyone is defined as either 'white' or 'colored' then it becomes a lot less based on general genetic characteristics but rather one specific set of genes - those relating to skin pigmentation.
The article linked to by Retrovirus makes a number of false assertions including:
"The point is, for race to have any scientific validity and integrity it has to have generality beyond any one species. If it doesn't, the concept is meaningless."
"In many other large mammalian species, we see rates of differentiation two or three times that of humans before the lineages are even recognized as races. Humans are one of the most genetically homogenous species we know of. There's lots of genetic variation in humanity, but it's basically at the individual level. The between-population variation is very, very minor."
Notice that the second quote actually contradicts the first. He fist claims that race is only used for humans and therefore is unscientific then claims that race has a definite generally accepted definition which applies across species.
It is a fact that in any species if there are two groups with distinctive differences in skin color or other noticeable features we will identify them as distinct populations. Whether will call them different varieties, races or ethnic groups is a matter of convention, but the existence of the distinct groups with their attendant features is a matter of scientific fact.