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Because if the same amount of genetic material is present, then the individual has all the correct material for normal development. In this case it is called a "balanced translocation" or BT. If there is extra genetic material (duplications) or of some of it is missing (deletions) then the individual most often has problems relating to physical and/or mental development. This is known as an "unbalanced translocation" or UBT. Duplications and deletions of genetic material also often result in miscarriage of the embryo. If the embryo survives, it very often has severe complications. So in cases of repeated miscarriage, it is important for the parents be be tested for possible chromosome issues.

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