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2.33 3.67 5.0 6.33 7.67 Phenotypic value (units of pigment)

Table 9.8 Derivation of the expected phenotypic values for marker genotypes used to estimate din a PI x F1 backcross mating design when QTL mapping with pairs of marker loci that flank a QTL.

F1 parent gamete

F1 gamete frequency

BC progeny genotype

BC progeny genotypic value

Frequency-weighted genotypic value

BC progeny marker genotype

Marker genotype frequency

Marker class mean (G^)

a^b, a1q1b2

a1q1b1 a1q1b1

+a +a d d +a d

0 0

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