The factors for these characters identified by Mendel in Pea are not linked to factors for other characters. 

A. Seed shape              B. Pod color                    C. Seed color                                   D. Pod shape

Factor or gene for seed shape is present on 7th chromosome. Factor for Pod color is present on 5th chromosome. Factor for seed color is present on 1st chromosome along with factor for Flower color. Factor for pod shape is present on 4th chromosome along with factor for stem height and Flower position.