Cover: The cover image is cropped from a portion of Figure 3b in this issue, pp. 2421-2434. Correlations between genotypes. 1 and 2 in both axes denote the two genotypes of marker 1, and 3 and 4 denote the two genotypes of marker 2; and so on, up to 11 and 12 denoting genotypes for marker 6. (The probabilities of the three possible genotypes sum to 1 so only two are included in the regression model.) Marker numbers correspond to the order as presented in Table 1. Scale denotes correlation coefficient (r). Please see article for more information.
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