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Fig. 4. Associations among the inbred lines revealed by principal component analysis performed on covariances between allele frequencies calculated from RFLP data of 105 loci. pBSSS and dBSSS lines are designated by solid and open squares, respectively; pBSSS lines originating from Reid Yellow Dent are underlined. pBSCB1 and dBSCB1 lines are indicated by solid and open circles, respectively. Lines derived from advanced cycles are given in italics. PC1 and PC2 are the first and second principal components. The dashed ellipses describe the clustering of the groups.
