Figure 2.—

A comparative genetic analysis of fourth chromosome vs. pericentric PEV. (A) Photographs of male progeny from crosses between females carrying a PEV reporter (as in Figure 1) and the following males: 1, y w^67c23 (wild type); 2, Su(var)3-9⁰⁶/Su(var)3-9⁰⁶ [SU(VAR)3-9 null (Reuter et al. 1986)]; 3, Dp(2;2)P90/CyO [two doses of HP1 (Wustmann et al. 1989), provided by J. C. Eissenberg]; 4, l(3)810/TM6 Tb [haplo-deficient H2Av (van Daal and Elgin 1992)]; 5, Su(var)3-7^P43/TM6 [G416E point mutation in Zn finger 4 of SU(VAR)3-7 (Bushey and Locke 2004)]; 6, Su(var)3-7^P12/TM6 [C-terminal deletion of SU(VAR)3-7 (Bushey and Locke 2004)]. (B) Eye pigment measurements and photographs of progeny without the balancer chromosome were carried out as described in the Figure 1 legend. Mean values that are significantly different from those of wild type (P < 0.05) are highlighted in yellow. Responses to a loss of SU(VAR)3-9 distinguish the fourth chromosome distal arm from the pericentric heterochromatin.