Similar to Anatomical Vestiges... Did you know that on the basis of one blood marker, you may be be closer to a Gorilla than another human? We share A/B/O hematology. Only common descent explains this. Trans-species polymorphisms http://evoandproud.blogspot.com/2012/09/trans-species-polymorphisms.html It is widely known that considerable genetic overlap exists between human populations, even those that are geographically distant from each other and quite different physically. You probably learned in BIO101 that genetic variation is much greater within than between human populations. It is less widely known that this high degree of genetic overlap also exists between many species that are nonetheless distinct morphologically, physiologically, and behaviorally (Frost, 2011). This is especially so with young sibling species. Such species differ only over a small fraction of the genome—at those genes where a certain variant is adaptive in one species but not in the other. Elsewhere, over most of the genome, the same variant works just fine in both species, either because the gene itself is of little or no value or because certain body functions are pretty much the same in a wide range of organisms. With time, and reproductive isolation, two sibling species will gradually lose this genetic overlap, as a result of random mutations here and there over the entire genome. The two species will be less and less alike even at “junk genes” of little value. Even so, some overlap will remain. It’s not just that we see the same gene in distantly related species. We also see the same gene with the same set of alleles—a trans-species polymorphism (Klein et al., 1998-. A good example is the ABO blood group system. On the basis of that gene marker, I probably have more in common with certain apes than I do with some of my readers. Such polymorphisms have in fact persisted for millions of years across multiple speciation events. Until recently, it was believed that trans-species polymorphisms were no more than an oddity. Now, it looks like they may be more common than previously thought"..>" [......] ...
It makes you closer to a gorilla with O negative than you are to someone with A or B type blood; based on blood type.
and More evidence of Evolution The Mystery of Human Blood Types The ABO blood group evolved at least 20 million years ago, but scientists still don’t understand the purpose of blood types By Erin Wayman - smithsonian.com - Oct, 2012 http://www.smithsonianmag.com/scien...man-blood-types-86993838/#gR0a1F8102WXMSca.99 Everyone’s heard of the A, B, AB and O blood types. When you get a blood transfusion, doctors have to make sure a donor’s blood type is compatible with the recipient’s blood, otherwise the recipient can die. The ABO blood group, as the blood types are collectively known, are ancient. Humans and all other apes share this trait, inheriting these blood types from a common ancestor at least 20 million years ago and maybe even earlier, claims a new study published online today in Proceedings of the National Academy of Sciences. But why humans and apes have these blood types is still a scientific mystery. The ABO blood group was discovered in the first decade of the 1900s by Austrian physician Karl Landsteiner. Through a series of experiments, Landsteiner classified blood into the four well-known types. <------->
I find it likely these blood types gradually evolved as dietary changes in nutrients came about. The body adapting to changing input and the ensuing requirements.
