A possible mutation of a fluorescence polymorphism

Abstract
The segregation of the Q[quinacrine]-band polymorphisms in 32 families were studied. From 90 matings in these families, there were a total of 208 offspring. In one of these offspring there was 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.