Chromosome constitution of plants with normal and translocated chromosomes: (A) A plant with a pair of normal chromosome 1s and a pair of normal chromosome 4s. (B) A plant heterozygous for a B-A translocation. The B-A is the TB-1Sb, the A-B is the 1-B, and a normal chromosome 1 and a pair of normal chromosome 4's are also present. (C) A plant heterozygous for an A-A translocation between chromosomes arms 1S and 4L. This translocation is named T1-4 (002-19) 1S.87 4S.42. A normal chromosome 1 and a normal chromosome 4 are also present. (D) A plant heterozygous for the B-A translocation TB-1Sb and for the T1-4 (002-19) translocation. The B-A (TB-1Sb), the A-B (1-B) chromosome, the 1-4 chromosome, the 4-1 chromosome, and a normal chromosome 4 are present. The normal chromosomes other than chromosome 1 and chromosome 4 are not shown in Figures 1–4.