Solution

The garden pea has 7 pairs of chromosomes (2n = 14).
Later studies showed that the genes for the seven characters studied by Mendel lie on only four different chromosomes (chromosomes 1, 4, 5 and 7).
Some of them are on the same chromosome but far apart, so crossing over is frequent and they still assort nearly independently. Mendel also did not test every pair of characters together, so he did not detect linkage.
So the genes are located on four different chromosomes.

Concept Location of Mendel's seven genes

Principles of Inheritance and Variation in past papers

198 questions from this chapter have appeared across 27 exam years.