A series of matings were done using T4 bacteriophage in order to map several del

Question

A series of matings were done using T4 bacteriophage in order to map several deletions and point mutations. If a point mutation is located in the region of the deletion, no recombination is possible and no plaques will form. Crossing bacteriophage with a deletion in region I with those bacteriophage with a point mutation in gene B results in plaques. A similar finding happens with a cross between deletion region III and point mutation B. However, no plaques form when deletion region II is crossed with this mutation. Where is point mutation B located? a. deletion region I b. deletion region II c. deletion region III d. none of these regions

Explanation / Answer

Answer: b. deletion region II

As per the given scenario since point mutation if present within the region of deletion gives no plaques, it means the point mutation B is located at deletion region II.

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