Figure 1

Relative proportions of parental and F1 trypanosomes in midguts. Flies were fed approximately equal numbers of bloodstream form trypanosomes and dissected on the days indicated. A. Combined results for F1R1 and F1R2 crossed with either an F1 hybrid clone (F1G1 or F1G2) or a parental clone (J10 GFP or 1738 GFP). B. Combined results for F1G1 and F1G2 crossed with either an F1 hybrid clone (F1R1 or F1R2) or a parental clone (J10 RFP or 1738 RFP). n = number of flies. For F1R1/F1R2, F = 93.842, P < 0.001, and for F1G1/F1G2, F = 227.208, P < 0.001, showing that in both cases there was a significantly higher proportion of the F1 clone in the back crosses compared to F1 crosses over time.