PPT Slide

Crosses between Outbred Lines

Lines are not fixed for alternate QTL alleles

Breed A X Breed B

Frequency Q pA pB

Backcross mMm -mmm= (pA-pB) (1-2r)(a+d)

F2 cross mMM -mmm= (pA-pB) 2(1-2r)a

• Choose markers that differ in frequency between the lines and F1 parents that are heterozygous for the markers (such that marker alleles can be traced to F2 progeny)

• Choose breeds that differ for the trait of interest

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