Table 1 Observed phenotypic segregation ratios for HN in the Pyrus PEAR3 × ‘Moonglow’ population.

From: Genome mapping of postzygotic hybrid necrosis in an interspecific pear population

Location and year of experiment

Number of seedlings

1:3 segregation ratio

3:13 segregation ratio

‘Type 1’

‘Type 2’ + ‘Type 3’

Total

X 2

df

ρ

X 2

df

ρ

Motueka 2010

153

21.7%

551

78.3%

704

4.01

1

0.045

4.11

1

0.043

Angers 2011

101

15.4%

556

84.6%

657

32.48

1

1.2 e-08

4.92

1

0.027

Motueka 2014

44

19.4%

183

80.6%

227

3.82

1

0.051

0.06

1

0.806

Pooled

298

18.8%

1290

81.2%

1588

32.92

1

0.000

0.00

1

0.987

Location and year of experiment

Number of seedlings

1:1 segregation ratio

‘Type 2’

‘Type 3’

Total

X 2

df

ρ

Motueka 2010

271

49.2%

280

50.8%

551

0.15

1

0.699

Angers 2011

260

46.8%

296

53.2%

556

2.33

1

0.127

Motueka 2014

79

43.2%

104

56.8%

183

3.42

1

0.064

Pooled

610

47.3%

680

52.7%

1290

3.80

1

0.051

  1. For each of the three experiments (Motueka 2010, Angers 2011, and Motueka 2014), seedlings were assigned to a class (‘Type 1’, ‘Type 2’ and ‘Type 3’). The chi-square (X2) test was performed for ‘Type 1’:‘Type 2’ + ‘Type 3’ = 1:3 or 3:13 and for ‘Type 2’:‘Type 3’ = 1:1 for all three experiments individually. The Pooled X2was also calculated. The degrees of freedom (df) and the ρ values are shown. At ρ <0.05, the observed segregation ratios are significantly different from the expected ratios.
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