In the garden pea, orange pods (orp) are recessive to green pods (Orp) and sensitivity to pea mosaic virus (mo) is recessive to resistance to the virus (Mo). A 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 with orange pods and sensitivity to the virus. The following results were obtained (show all work as needed)

160 orange pods, virus sensitive
165 green pods, virus resistant
36 orange pods, virus resistant
39 green pods, virus sensitive

a. Apply the Chi Squared test to determine if these genes are sorting independently.

b. If you determine the genes are linked, calculate the number of map units between them.

c. What is the maximum distance (in map units) that can exist between two linked genes? Explain your reasoning.