Why do we have blood types?

This is a very interesting article, but the core question is completely wrong-headed. There is no “why”. We just do. Evolution is as much about errors in the replication of DNA as anything else; some errors convey serendipitous advantages, others disadvantages. Some make no appreciable difference. Blood types fall into the latter category, having simply arisen as variations which had no impact on successful breeding or survival. Until the advent of blood transfusion techniques, blood type would seem to have had little if any consequence for an organism whatsoever.

Why do we have blood types? | Mosaic.

A Matter Of Faith

In my blogging, I have often written on subjects or re-blogged articles concerned with religion. In GibberLog, I might be interested in how religion interacts with politics and policy on such matters as education. In BlatherLog, the concern will be the role of religion in history, or its engagement with the sphere of science (often again touching on how science is taught in schools). It is pretty common for me to play Devil’s Advocate when I blog, and it isn’t always clear whether I have a consistent position on anything at all. Partly this is deliberate, but partly it also reflects the fact that I am not an ideologue, and my genuinely held views are often inconsistent or hail from different parts of the philosophical spectrum. I think most people are like that, really. It is only academics and politicians who have to pick an ideology and stick to it come hell or high water (and often not even politicians!). Continue reading