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Susceptibility to ticks

With no markers:

Dad Mum

1 2 3 4

Prog.

5 6

With marker locus, r = 0.1:

Dad Mum

A B A C

1 2 3 4

Prog

A C

5 6

Y = XB + Zu + ZQv + e

u = ‘polygenic’ breeding values

v = average effects of QTL alleles

GRM method ...From QTL breeding values to QTL genotype probabilities?

2 alleles

assumed here