May the best man win.

Natural selection can have its positives and negatives. These articles all consist of a general idea that species with heterozygous genes have the advantage over others of being immune or having a special defense against certain diseases. The disadvantage with that being that though they lucked out, their next of kin may get a bad roll of the genetic dice and have some sort of horrible disease. Due to culture and morals sometimes certain cultures continue to breed within their own and not spread these positive immunities.
For instance, the Jewish culture is taught to keep their populace entirely pure. The trouble with that is it’s causing a problem in the Eastern European group of Jews. Scientist have studied that the Tay-Sachs disease is more common in Eastern European Jews than in any other race. Also that in their ancestors a common cause of death was Tuberculosis (TB). TB being easily obtained when in close quarters, as with any other disease, was common due to the poor liv...