The first linkage map

The original Drosophila X chromosome map of five genes assembled by Alfred Sturtevant (top) and the contemporary X-chromosome map for Drosophila based on current data (bottom). Sturtevant’s map is based in part on the recombination frequencies given in Table 5.2The original Drosophila X chromosome map of five genes assembled by Alfred Sturtevant (top) and the contemporary X-chromosome map for Drosophila based on current data (bottom). Sturtevant’s map is based in part on the recombination frequencies given in Table 5.2

yw vm r Centromere Sturtevant’s map Map units (m.u.) 0.01.0 30.7 33.7 57.6 yw vm r Centromere Contemporary map m.u. 0.01.5 33.0 36.1 54.5