In an experiment similar to the Lederberg and Tatum experiment, researchers grew

Question

In an experiment similar to the Lederberg and Tatum experiment, researchers grew two strains of E. coli in complete medium.

E. coli strain AX has the genotype AmpSbio+ trp+ leu-.

E. coli strain AY has the genotype AmpRbio- trp- leu+.

The researchers then plated the bacteria on different media types.

Next, the researchers mixed equal amounts of the AX and AY E. coli strains. On which type(s) of media would growth provide evidence that genetic transfer had occurred between the two strains of bacteria?

Select all that apply.

bio- leu-

bio- trp-

trp- leu-

leu- trp- bio-

none of the above

* the answer is not leu- trp- bio-

*the answer is not leu- trp- bio- AND bio- trp-

Explanation / Answer

The media that can be used is leu(-) trp(-) bio(-) and bio(-) trp(-).. As AX can't grow media deficiency of leu.. Wheares the AY can't grow on media deficiency of other both.. Hence if a recombination would have occur then the AY could grow on that..!!

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