Distribution of the 119 566 loci on the 21 wheat chromosomes. The 21 circles indicate the 21 wheat chromosomes, with 7D to 1D, 7B to 1B, and 7A to 1A from inside to outside, respectively. Each chromosome was evenly divided into 100 segments based on the map length, which are shown with different colours. The arc lengths indicate the percentage of markers on each segment (The total number of markers on the corresponding chromosome divided by the number of markers on the segments). The arc in red colour indicates the chromosomal bins near the centromere. The upper left histogram in the circle indicates the distribution of markers on each chromosome; the upper right histogram in the circle indicates the distribution of markers near the centromere on each chromosome; the bottom right histogram in the circle indicates the distribution of map length on each chromosome; the bottom left histogram in the circle indicates the distribution of markers in/near the coding sequences.