Abstract
Linkage estimation and genetic map construction with genotyped DNA markers in plants preferentially employ a few maximally informative early-generation or recombinant-inbred mating designs. Fitting their recombination models to unconventional designs adapted to cultivar development (series of backcrossing, selfing, haploid-doubling, random-intercrossing, and sib-mating steps) distorts single- and multipoint linkage estimates even with dense marker coverage. Two methods are provided for correct linkage estimation in unconventional designs: fitting a correct multigeneration model, or correcting the estimates produced by fitting a one-generation model with any conventional software. These methods also support calculation of multilocus genotype frequencies and QTL-genotype distributions and are available in software.
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Acknowledgments
Hermann Buerstmayr posed a motivating question and provided sample data. Thomas Schiex and colleagues compiled contributed code into CarthaGene. Prof. Eberhard Weber pointed out errors and an alternative calculation for crossover expectation. The editor is thanked for bringing additional references to my attention. This is contribution 11-117-J from the Kansas Agricultural Experiment Station.
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Communicated by M. Sillanpaa.
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Nelson, J.C. Linkage analysis in unconventional mating designs in line crosses. Theor Appl Genet 123, 897–906 (2011). https://doi.org/10.1007/s00122-011-1635-3
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DOI: https://doi.org/10.1007/s00122-011-1635-3