
Recombination landscape after multiple rounds of intercrosses. (A) Expansion of the genetic map, measured in recombination units (ru) of 100 times the average number of recombination events from first to 12th generation (bottom) of a 200-kb chromosome XIII locus genotyped at nine markers (top). (B) Genetic background of two segregants from a first (F1) and sixth (F6) generation cross shows a sharp increase in recombination events.











