Comparative map of chicken and duck chromosomes 1–8 and Z. The G-banded ideograms of chicken (Gallus gallus; GGA) and duck (Anas platyrhynchos; APL) chromosomes 1–8 and Z are shown with the positions of all BACs successfully hybridized to both species as determined by FLpter measurements. Intrachromosomal rearrangements can be seen on GGA and APL1, 2, 4, 7, 8 and Z. GGA4p corresponds to APL10. Note the orientation of APLZ. Ideograms were prepared from[13, 21]. Error bars represent one standard deviation.