Somatic Crossing-Over and Somatic Translocations

Abstract

Jones has suggested that mosaic spots in Drosophila, which Stern has described as products of somatic crossing-over, are the rare survivors of a process of random exchange, homologous or non-homologous. The author''s evidence indicates that in Drosophila, cells which through somatic crossing-over receive unbalanced chromosomal complements may live; the rare occurrence of such cells is strong indication that somatic exchanges in Drosophila occur generally at homologous loci.