FIG. 6.

Estimation of conversion tract lengths. Open and shaded boxes correspond to IR substrates with four hypothetical mismatches (a through d), which divide the 350-bp substrates into five 70-bp intervals of perfect identity (1 through 5). As shown, intrachromatid and sister chromatid events that have identical endpoints (one endpoint in interval 2 and the other in interval 4) correspond to conversion tracts of different lengths: 140 and 350 bp for intrachromatid crossover and sister chromatid conversion events, respectively. If the products are viewed linearly along one chromosome, however, they appear identical.