The correct option is A genes of seven types of traits selected by him were located on four different chromosomes and behaved independently
Linkage is the phenomenon of genes staying close together on the same chromosome and getting inherited as a unit without separation.
The genes of seven types of characters selected by Mendel were located on four different chromosomes 1, 4, 5, 7.
Since the genes were present on different chromosomes, and the ones present on the same chromosome were also situated far apart, he didn’t observe any linkage in the genes.