
Sequence differences (S) per site between AF16 and shotgun reads of Tropical strain VT847 (polymorphism, gray squares) and shotgun reads of Temperate strain HK104 (divergence, black diamonds) are greater in high-crossover regions of the genome, for both synonymous sites (A) and replacement sites (B). (C) The ratio of replacement to synonymous site differences within or between populations indicates an excess of replacement differences in regions experiencing little crossover. Black and gray horizontal lines indicate the null expectation for inter- and intrapopulation differences, respectively.











