Question

In: Biology

Bacterial strain A (met+, his-, arg+) is mixed with bacterial strain B (met-, his+, arg-), grown...

Bacterial strain A (met+, his-, arg+) is mixed with bacterial strain B (met-, his+, arg-), grown in complete media, then plated on minimal media. The colonies that grow on the plate indicate that ________.

Group of answer choices

the wild-type met gene has been transferred from A to B

the wild-type met and arg genes have been transferred from A to B

the wild-type his gene has been transferred from B to A

the wild-type arg gene has been transferred from A to B

genes have been transferred between A and B, but no further conclusions can be made

Solutions

Expert Solution

Answer- the wild-type met and arg genes have been transferred from A to B.

According to Lederberg and Tatum of genetic recombination theory,the mixing of Bacterial strain A (met+, his-, arg+) with bacterial strain B (met-, his+, arg-) ,exchange the genetic material in complete media.When mixture plated on the minimal media (having less nutrients), the recombinant cells (met+,his+,arg+)were able to synthesize the constituents for metabolism. The Bacterial strain A (met+, his-, arg+) and bacterial strain B (met-, his+, arg-)separately can't grow as they can't synthesize the constituents for metabolism.


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