Figure 16.

Polytene X (A), second (B and C), and third (D and E) chromosome maps after Bridges and Lefevre showing the relative map positions of markers useful for recombination mapping. Stocks containing different combinations of these markers are available at the Bloomington Drosophila Stock Center (http://flystocks.bio.indiana.edu/Browse/misc-browse/mapping.php and http://flystocks.bio.indiana.edu/Browse/misc-browse/Baylor-kits.php). The tables above the chromosomes list the gene symbols (top row), numbered and letter cytological location (middle row), and approximate recombination map position in centi-Morgans of each marker. The lines connecting the tables to the chromosome arms indicate the approximate cytological position of the markers. The markers include lesions that are associated with visible phenotypic changes as well as transgenic insertions carrying the w⁺ gene.