Fig. 1.

Epigenetic contributions of polymorphic Y chromosomes to global chromatin regulation in somatic tissues. (A) Variation in eye pigmentation in stocks carrying the X chromosome marker w[m4h] and Y chromosomes sampled from diverse localities worldwide. (B) Eye phenotypes showing differential variegated expression for w[m4h] in four Y chromosome backgrounds. These flies are genetically identical except for the origin of the Y chromosome. (C) Differential variegation between Y[Congo] and Y[Ohio] strains for the X-linked marker w[m4h] and second chromosome markers bw[D] and lt[x13].