What Is Matrilineal Preservation? And Why Is It So Important?

At this point, we present to you the third principle of the Oral Torah. We call it the Insurance Principle. But we also call it the principle of Matrilineal Preservation. This principle guarantees the steady progress of evolution within the hidden phase by ensuring that all female offspring are kept within the community from one generation to another.  Males are allowed to marry from outside the society, provided that the women being married into the society are virgins. But daughters are forbidden to marry from outside the community.
This is because the hidden phase of evolution progresses steadily along the matrilineal line, that is from mother to daughter. And a loss of a matrilineal  lineage to the outside community must be considered a great waste of efforts and time. This is so because evolutionary developments in the hidden phase, which takes place exclusively  within the mitochondria of female offspring, would be silenced indefinitely, if violation of the DNA Unitarity principle kicks in. 
 Jews are instructed to observe what is best described as the Matrilineal Reservation. The written Torah contains several verses that allude to this, and critics have used these verses to label Jews as racist for generations (Deuteronomy chapter 7 verse 3; Nehemiah chapter 13 verses 23 to 25) . Moses was only putting emphasis on an instruction that was originally part of the Oral Torah.
The importance of this instruction is now obvious: it was given to act as a guaranty or insurance against the loss of constructive evolutionary developments already achieved but hidden within female mitochondria.
Today, it is imperative that the non-orthodox factions of Judaism come to know this scientific fact and adjust their stance with respect to inter-marriage accordingly. This also applies to the Jews from Africa and Russia that made Aliyah to Israel in recent times. The very essence of the Matrilineal Preservation is to preserve progresses made over so many generations that are hidden in the old matrilineal generations—the mitochondria remains chiefly maternally inherited.
The good news is that we can do so, while, at the same time, allow new matrilineal generations to start from ground zero by creating new Jewish societies , with individuals not only from Israeli populations without Jewish matrilineal history, but also with individuals from diverse Gentile populations who are ready to uphold the three principles of the Oral Torah, and  ready to dedicate their offspring to this cause.
Matrilineal Preservation is one of the three doctrines of semitism and one of the three instructions of the Oral Torah.