<unk> ism (DTM) is a chromosome disorder. Individuals with<unk><unk>  syndrome have some cells with three copies of each chromosome for a total of 69 chromosomes (called<unk>  cells) and some cells with the usual 2 copies of each chromosome for a total of 46 chromosomes (called<unk>  cells). Having two or more different cell types is called mosaicism.<unk> ism can be associated with truncal obesity, body/facial asymmetry, weak muscle tone (hypotonia), delays in growth, mild differences in facial features, fusion or webbing between some of the fingers and/or toes (syndactyly) and irregularities in the skin pigmentation. Intellectual disabilities may be present but are highly variable from person to person ranging from mild to more severe. The chromosome disorder is usually not present in the blood; a skin biopsy, or analyzing cells in the urine is needed to detect the<unk>  cells. A regular human carries 23 pairs of chromosomes in his or her cells. Cells containing two pairs of chromosomes are known as<unk>  cells. Those with<unk> ism have some cells which are<unk> , meaning that they have three copies of chromosomes, or a total of 69 chromosomes.<unk> y is distinct from trisomy, in which only one chromosome exists in three pairs. A well-known example of trisomy is trisomy 21 or Down syndrome.
Diploid triploid mosaic
Germline mosaicism
Monosomy
Trisomy
Heteroxeny
Polyploidy
Robertsonian translocation
Isodisomy