title: A possible mutation of a fluorescence polymorphism.
abstract: The segregation of the Q-band polymorphisms in 32 families have been studied. From 90 matings in these families, there were a total of 208 offspring. In one of these offspring it could be shown that there had been a change of a fluorescent polymorphism, resulting in the loss of fluorescent intensity in the satellite of a chromosome 21. The origin of such a 'mutation' and a consideration of mutation rates is discussed.
mesh_terms: D002904:Chromosomes, Human, 21-22 and Y; D004247:DNA; D004276:DNA, Satellite; D005453:Fluorescence; D006801:Humans; D007621:Karyotyping; D009154:Mutation; D011110:Polymorphism, Genetic; D013194:Staining and Labeling
chemical_list: D004276:DNA, Satellite; D004247:DNA