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Identification of Essentially Derived Varieties Obtained from Biparental Crosses of Homozygous Lines

I. Simple Sequence Repeat Data from Maize Inbreds

^a Institute of Plant Breeding, Seed Science, and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
^b Crop Science Dep., Univ. of Illinois, S-110 Turner Hall, 1102 South Goodwin Ave., Urbana, IL, 61801

View larger version (20K): [in a new window]   Fig. 1. Cumulative frequency distributions of GD(P1,O) for F2–, BC1–, and BC2–derived progenies based on simulated data assuming GD(P1,P2) = 0. Type I () and Type II (ß) errors refer to a threshold of GD = 0.37 for discriminating F2– vs. BC1–derived progeny lines.

View larger version (33K): [in a new window]   Fig. 2. Standard errors of pairwise genetic distances (GDs) and their corresponding GD values observed for 220 maize inbred lines with 100 simple sequence repeats.

View larger version (34K): [in a new window]   Fig. 3. Histograms of estimated (columns) and simulated (curve) parental contributions (p) for F2– and BC1–derived progeny lines. Means of estimated () and simulated [µ(p-sim)] values are indicated by dotted and dashed lines, respectively.

View larger version (36K): [in a new window]   Fig. 4. Histograms of Rogers' genetic distances calculated from simple sequence repeat data between unrelated (f = 0) lines from European Flint and Dent lines as well as parents of introgression lines. Variables n, µ, and SD refer to the number of values, arithmetic mean, and the standard deviation of GD values for the particular distribution, respectively. Means are indicated by solid lines.

View larger version (70K): [in a new window]   Fig. 5. Cumulative histograms (columns) and approximated ß distributions (curves) for genetic distances based on 100 simple sequence repeats for F2–, BC1–, and BC2–derived progenies. Variables n, µ, and SD refer to the number of values, arithmetic mean, and the standard deviation of genetic distance values for the particular distribution, respectively.