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We have recently become interested in the use of natural mammalian mosaic populations as markers for embryological and developmental studies. A variety of mosaic populations have been described, ranging from mixtures representing complete composites of two different individuals (e.g. double fertilization cases: Gartler, Waxman, and Giblett, 1962; and Zuelzer, Beattie, and Reisman, 1964) to those mosaic populations unique to the mammalian female in which the cell types differ in heritable somatic phenotypes controlled by the X-chromosomal inactivation mechanism (Lyon 1962; Ohno and Cattanach 1962; Beutler, Yeh, and Fairbanks 1962; and Russell 1963). In general, detectable mosaic populations will originate at an early embryonic stage, and if appropriately marked, they may be used to investigate the origin and growth of various tissues and organs. Mosaics originating at a very early stage (e.g. XO/XXX and XO/XYY chromosomal mosaics which would arise at the first cell division of the zygote) could be...
Gartler et al. (Wed,) studied this question.