An experiment to determine the inheritance of flower color i

An experiment to determine the inheritance of flower color in snapdragons crossed two plants with pink flowers. The following progeny were recovered from the cross: 80 plants had red flowers, 152 had pink flowers, and 67 had white flowers

Use chi square test to determine where those numbers fit a Mendeliam pattern of inheritance

a. write hypothesis

b. calculate chi square

c. calculate p-value

Solution

Use chi square test to determine where those numbers fit a Mendeliam pattern of inheritance

a.   write hypothesis

Ho: the inheritance of flower color follows the ratio 0f 1:2:1

Ha: the inheritance of flower color does not follows the ratio 0f 1:2:1

b. calculate chi square

c. calculate p-value

observed

expected

o-e

(o-e)^2/e

red flowers

80

75

5

had pink flowers

152

149

3

white flowers

67

75

5

299

Chi squared equals 1.247 with 2 degrees of freedom.
  The two-tailed P value equals 0.5360
  By conventional criteria, this difference is considered to be not statistically significant.