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Distribution of crossover numbers among 282 trisomy 21 cases. The TroX analyses were obtained by applying the method to triploid proband data with and without using paternal genotype data. The Oliver et al. (2012) results come from the application of a method outlined in their paper to the same data, using paternal genotype data. Left panel: MI non-disjunction. Right panel: MII non-disjunction. The error bars represent the 95% confidence intervals
