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# Chi Square and Genetic Cross

APBIO-NJL4FK

Green pea seeds are dominant to yellow pea seeds. In a cross between a plant heterozygous for seed color and a yellow-seeded plant, 400 offspring are produced. 187 of these offspring have green seeds.

Using the chi-square analysis, how does the calculated chi-square value relate to the ratios predicted by Mendelian genetics?

A

Since the chi-square value is 0.845, which is less than 3.841 with p = 0.05 and one degree of freedom, there is no statistical difference between observed and expected values.

B

Since the chi-square value is 1, which is less than 3.841, there is no statistical difference between observed and expected values.

C

The chi-square value of 3.84 is greater than 1.69, with two degrees of freedom, which indicates that there is a significant difference between observed and expected values.

D

The chi-square value of 1.69 is less than the critical value 3.84, where p = 0.05 and one degree of freedom, and therefore, there is no significant difference between observed and expected values.