Ziggy, Yes, in high school they teach that DNA is cut and dried. But like so many subjects, there are textbooks, and there are real world situations. I knew a guy who was a broadcast engineer for the government that recruited new hired while they were still in college. The new hires would go to school for 6 months, then work for 6 months as trainees. My engineer friend told me they spent nearly the first half of the 6 months of on the job training to unteach what they had learned in school, because what they learned in school was theory that often didn't include all the booger factors you find in real world scenarios. The same is true for DNA. In genealogy, one quickly learns that DNA can prove a relationship exists, but more often than not, there are too many variables for it to be proof positive of what that relationship is. You get half your DNA from each of your parents. They in turn got half of their DNA from THEIR parents, and so on. But there is no telling WHICH half of their DNA will be given to their offspring, and where THEY might have gotten in from. One little piece from a 2 or 3x great grandparent could still be hanging around and get passed along.
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