Combination of twelve alleles at six quantitative trait loci determines grain weight in rice
Table 3
Quantitative trait loci (QTLs)-by-population interactions examined using two-way analysis of variance.
As there were three types of mapping populations (F2, F3, and recombinant inbred line populations), there were two degrees of freedom. There were two genotypes at each QTL (heterozygotes were omitted and not used in analysis) and the degree of freedom for QTL was 1.