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(a) What conclusions can you make about that order of these three genes on the chromosome?

(b) Which two genes are closest?

22. Two mutations that affect plaque morphology in phages (a- and b-) have been isolated. Phages carrying both mutations (a- b-) are mixed with wild-type phages (a+ b+) and added to a culture of bacterial cells. Subsequent to infection and lysis, samples of the phage lysate are collected and cultured on bacterial cells. The following numbers of plaques are observed:

Number

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