Chapter 10, Problem 4GP

In tomatoes, round fruit (R) is dominant to long fruit (r), and smooth skin (S) is dominant to fuzzy skin (s).

A true-breeding round, smooth tomato (RRSS) was crossbred with a true-breeding long, fuzzy tomato (rrss). All the F₁ offspring were round and smooth (RrSs). When these F₁ plants were bred, the following F₂ generation was obtained:

Round, smooth: 43

Long, fuzzy: 13

Are the genes for skin texture and fruit shape likely to be on the same chromosome or on different chromosomes? Explain your answer.