A Mutual Translocation Involving the Fourth and the X-Chromosomes of Drosophila

Abstract

In the "mottled 5" stock of D. melanogaster the X-chromosome is broken between white and facet; the left end is attached to the IV. The IV-chromosome is broken between eyeless and bent, and the eyeless part is attached to the right portion of the broken X. This mutual translocation was produced by x-ray. Non-disjunction of IV occurs very frequently. A gene important for viability is located in the left (eyeless) end of the IV.