Fig. 3. Meiotic and physical map of the vbg interval on LG23. Markers that were meiotically mapped are shown in bold at the top of the figure, and the number of recombination breakpoints between these markers found after analysis of 8512 informative meioses is shown just below the line representing LG23. Markers that were only physically mapped or for which recombination was not assessed in all 8512 informative meioses are shown in plain type. Markers beginning with ‘z’ and bac156CA are SSLPs. Markers beginning with ‘y’ are single nucleotide polymorphisms (SNPs) found in YAC ends. Markers beginning with ‘b’ are SNPs found in BAC ends. Remaining markers are genes or ESTs. The open box in YAC23g10 represents an internal deletion. The genomic region deleted in vbg^df(LG23)w5 is represented by the dotted box. The critical interval (0.035 cM) defined by meiotic fine mapping is represented by the gray shaded box. The full acvrl1 gene falls within this critical interval.