It is a pity that there is no discussion if the detected amounts of extra 21 chromosome indicated a full Down syndrome or a mosaic version thereof. In a mosaic

It is a pity that there is no discussion if the detected amounts of extra 21 chromosome indicated a full Down syndrome or a mosaic version thereof. In a mosaic version, only a part of your cells are trisomic, perhaps even just as little as 1/5th. In that case, the characteristic symptoms are often fewer and lighter, which would help that person survive in the Stone Age world.