Fig. 1. The structure and recombination patterns of the engineered translocation chromosomes MA and Te. Shaded boxes indicate rye chromatin; blank boxes indicate wheat chromatin. Elongated x's indicate the positions of crossovers. A: recombination of the short arm (S) of chromosomes MA with 1BS; B: recombination of MA(S) with 1RS; C: recombination of Te(S) with 1BS; and D: recombination of Te(S) with 1RS. All chromosomes have normal 1BL arms; drawings not to genetic or physical scale.