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The second instruction of the Oral Torah is what we call Matrilineal Preservation. It is based on the fact that the main part of biological evolution, the hidden phase, takes place in the mitochondria, and the mitochondria are maternally inherited. This instruction is given to guarantee 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. (For example, Moses married a virgin from outside the community.) 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 “generational” 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 disrupted indefinitely, if violation of the DNA Unitarity principle (reproductive fidelity) kicks in. In other to ensure that this doesn’t happen, women are not allowed to marry anyone outside the community.
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