From: Construction of genetic linkage map and identification of a novel major locus for resistance to pine wood nematode in Japanese black pine (Pinus thunbergii)
Progeny
No. of plants/Phenotypic score
Total
Binary standarda
Expected ratio (1:1)*
Expected ratio (3:1)*
S1
S2
S3
S4
Resistant
Susceptible
X2
p-value
Tanabe 54′ x ‘Tosashimizu 63’
88
6
2
92
188
94
0.00
1.00
62.67