Question

By the way, my homework is due Wednesday, November 13th at 4:10 pm. I would appreciate it if you could please walk me through all of the steps to solve all parts of this problem. In the garden pea, orange pods (g) are recessive to green pods (G), and sensitivity to pea mosaic virus (m) is recessive to resistance to the virus (M). A true-breeding plant with orange pods and sensitivity to the virus was crossed to a true-breeding plant with green pods and resistance to the virus. The F1 plants were then testcrossed to plants homozygous recessive for both traits. The F2 progeny counts are as follows: 160 have an orange pod color and are sensitive to the virus, 140 have a green pod color and are resistant to the virus, 107 have an orange pod color and are resistant to the virus, and 113 have a green pod color and are sensitive to the virus.
a. Are these genes linked? Give the chi squared value to test this hypothesis.
b. Given your chi squared value and the degrees of freedom, should we reject the null hypothesis?