Genetic Features - Figure 2. Loss of Sex Chromosome During Early Embryo Development

If an X chromosome is lost during an early cell division, daughter cells – some 45,X and some 46,XX are variably mixed together giving rise to all the differentiated tissues of the girl in a mosaic pattern. The manifestations of Turner syndrome will depend on the proportion of normal vs monosomic cells in the different tissues. The karyotype is specified: 45,X/46,XX