Question

When pink sweet peas were self-pollinated and the sceds were collected and sown, the following flower colors were obtained

Red 34
Pink 76
White 40
Use a chi-squared test to determine whether these results are consistent with the hypothesis that pink flowers are heterozygous for a single pair we predict for our null hypothesis?
A. 9:3:4
B. 3:1:0
C. 1:2:1
D. 1:4:1

Answer 1

The proportions 1:2:1 are consistent with thenull hypothesis that the pink flowers are heterozygous for a single pair.

Option C

Explanation:

Chi square test is used to

(i) Find significant difference in two or more than two proportions

(ii) The goodness of fit between the observed and expected frequency.
`X^(2)=(\sum(O-E)^(2))/(E)`

`X^(2)=\left[((34-37.5)^(2))/(37.5)\right]+\left[((76-75)^(2))/(75)\right]+\left[((40-37.5)^(2))/(37.5)\right]`

= 0.3266 + 0.0133 + 0.1666 = 0.506

5% Critical value = 5.991

Degree of freedom = 2