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. 2007 May;176(1):625–644. doi: 10.1534/genetics.106.064493

TABLE 1.

Genotypes and genotypic values of populations and data sets

Population and data seta RIL genotypeb Genotype of the population/data set Genotypic valuec Half of the QQ vs. qq contrast [(QQ − qq)/2]:
RIL QQ QQ P + a
qq qq P − a c0 = (2a)/2 = a
TC(B) QQ Qq P + d
qq qq P − a c1 = (a + d)/2
TC(H) QQ QQ P + a
qq Qq P + d c2 = (a − d)/2
TC(F) QQ Inline graphic Inline graphic
qq Inline graphic Inline graphic c3 = a/2
SUM QQ QQ + Qq 2P + a + d
qq Qq + qq 2P − a + d cSUM = (2a)/2 = a
TC(B) Hmp QQ Inline graphic Inline graphic
qq Inline graphic Inline graphic Inline graphic
TC(H) Hmp QQ Inline graphic Inline graphic
qq Inline graphic Inline graphic Inline graphic
DIFF QQ QQ − Qq a − d
qq Qq − qq a + d cDIFF = (−2d)/2 = −d
a

Populations are the RILs, their corresponding testcrosses to B73 parent [TC(B)], to H99 parent [TC(H)], and to the F1 hybrid [TC(F)]. Data sets were obtained by the sum TC(B) + TC(H) [SUM], the difference TC(H) − TC(B) [DIFF], the midparental heterosis (Hmp) of each TC(B) [TC(B) Hmp = TC(B) − MP, where MP = (RIL + B73)/2] and each TC(H) [TC(H) Hmp = TC(H) − MP, where MP = (RIL + H99)/2].

b

Q, QTL allele of H99; q, QTL allele of B73.

c

P, mean of the two QQ and qq homozygotes; a, additive effect; d, dominance effect. a has been defined as Inline graphic(H99 − B73), and it is positive when H99 has the highest value.