Figure 3.—

Fine-scale genetic mapping of hlx. (A) A collection of 131 viable lines (shaded) and 128 lethal lines (solid) was used to map the location of hlx to the bracketed interval proximal to CG13865. Diamonds represent position of molecular markers, and the inverted solid triangle represents location of P[w⁺]-insert. (B) Cytogenetic map of the centromeric heterochromatin of the X chromosome (of D. melanogaster) showing heterochromatic regions h26–h34 and the centromere, (C) Solid and shaded lines represent hybrid lethal and viable sublines genotyped at CG13865 and su(f); mau, D. mauritiana and “sib,” D. simulans or D. sechellia. The number of lines genotyped is shown for each class.