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If two Rh Positive parents can give birth to an RH negative child, is it really a blood line or a blood type? RH negative isn;t a blood line. It's a blood type null of the rhesus monkey gene. O was the Original from Gods first creation A- B and AB were mutations/manipulations along the way.
The way they track Family by blood lines is through genetic markers in the DNA.
"While 99.9% of our genome is identical, it’s the variations found in the 0.1 percent that distinguish us from each other."
Trace Your Family History through DNA Testing | Answers in Genesis
According to American Demographics, 113 million Americans have begun to trace their roots.
https://answersingenesis.org/genetics/dna-similarities/trace-your-family-history-through-dna-testing/What is an "e" ?
Can two Rh-positive parents have an Rh-negative child?
Give Blood for Life!
https://stanfordbloodcenter.org/can-two-rh-positive-parents-have-an-rh-negative-child/Child of God, mother of two, retired R.N. Proud to be an American! God bless the USA!
Actually one of the parents does not have to be Rh negative.