Mutual mapping of RFLPs and 33 B-10L translocations --Cheng, Y-M, Lin, B-Y Hypoploids and hyperploids, produced by crossing B73 with pollen of B-10L translocations present in the W22 background (Lin, MNL 48: 182-184, 1972), were used to map RFLPs. Because the hypoploid, but not hyperploid, is deficient of the distal portion of 10L, the absence of the paternal signal indicates an RFLP position distal to the breakpoint. By the same rationale, the presence of the paternal signal implies a proximal position. Altogether, 7 RFLPs were analyzed against this set of translocations, and they divide the set into six groups. The most proximal group includes four translocations (TB-10L19, TB-10L26, TB-10L22, and TB-10L7), and the most distal one has a single translocation (TB-10L32) (Figure 1).

Figure 1. Map position of 33 B-10L translocations. a, b indicate that no polymorphic parental signals for umc64 (a) and csu745a (b) were detected in hyperploids of the translocations in parentheses.

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