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A generalized transducing phage is used to transfer genes from a thr(+)bio(+)thi(+) donor strain of E....

A generalized transducing phage is used to transfer genes from a thr(+)bio(+)thi(+) donor strain of E. coli to a thr(-)bio(-)thi(-) recipient strain. When transductants selected on a medium containing thiamine and threonine are tested for growth on other media, many more colonies are found on media supplemented only with threonine than on media supplemented only with thiamine. No transductants survive on minimal media.

What is the correct order for these three genes?

*I have seen multiple different answers for this, either bio-thi-thr or thr-bio-tri so if you could explain which one it is and why that would be great!*

Which two genes are most closely linked?

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