(E) a+ and b+ are more closely linked than a+ and c+. If two genes are present on the same chromosome, they are less likely to undergo recombination. If they are very closely located, they do not undergo recombination and that pair of genes occur more frequently. Solution (E) a+ and b+ are more closely linked than a+ and c+. If two genes are present on the same chromosome, they are less likely to undergo recombination. If they are very closely located, they do not undergo recombination and that pair of genes occur more frequently..