(sabkÉnËtrÓktÉ) , ((American) sabËkontraktÉr) noun. a person who undertakes work for a contractor and is therefore not directly employed by the person who wants such work done. The building contractor has employed several subcontractors to build the block of flats.
Furthermore, three unrelated fragile X patients were found with a C-to-T point mutation at the 14th nucleotide in intron 10 with normal length CGGÂ·CCG repeats (Fig. 1F) (42). Clearly, these point mutations are sufficient for the development of the fragile X syndrome.
In the mosaic form of triple X syndrome only a number of body cells have the extra chromosome. Most cases of triple X syndrome are caused by a malformed egg or sperm. Triple X syndrome is sometimes called 47, XXX syndrome because the extra chromosome gives that human 47 chromosomes (instead of the usual 46).