How blood types are determined. The ABO blood typing system, including the Rh factor.
You can read more about blood typing by reading my aricle at Ezine articles. Just click on the link below, then scroll down and click on "Blood Types - The Basics" by Elizabeth Blake.
Our human genome is full of viruses similar to HIV-1. These have played an important role in human evolution and still play an important role in human embryology and day-to-day chemistry. Just how important are they to our evolution past and future?