Abstract
IN two previous papers the writers have recorded An effect of X-rays on the linkage of Mendelian characters in the second chromosome of Drosophila melanogaster (Mavor and Svenson, 19123, 1924). It is of interest to determine whether this effect on crossingover, which consisted in an increase of the crossover value, is inherited. The experiment reported here was designed with this end in view. As in the case of the experiments reported in the papers referred to above the X-rayed and control females had the constitution (b pr c/+ + +); that is, they had the genes for black, purple and curved in one chromosome and the genes for the normal allelomorphs of these in the other chromosome. These heterozygous females were mated to males of the constitution (b pr c/b pr c); that is, the males were homozygous for black, purple and curved.
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