80. In the deletion-mapping problem below, the solid bars represent normal or wi

Question

80. In the deletion-mapping problem below, the solid bars represent normal or wild type DNA or chromosomes and the open boxes missing DNA or deletion mutants, Several mutant viral strains were crossed with these deletion mutants and allowed to un recombination viral strain of interest and one were introduced of common bacterial simultaneously to replicate) lf recombination resul then the the viral strain interest was not located in that particular strain mutants in the open boxes below the deletion mutant map on the mexL Table of is below. Deletion Deletion Table of recombination among deletion mutants and viral strains

Explanation / Answer

ANSWER 1.

If complementation occurs, it means that the two loci are different. If complementation does not occur, it means that the two loci are same.

In the above case, there seem to be 6 loci (1X3; 1X4; 1X5; 2X3; 2X4; 2X5). But 1 and 2 are same loci. So, the cross (1X3) and (2X3) are same. Therefore, the total loci comes out to be 3. These are loci 1/2, 3/5, 4.

4........................(25cM)....................................1.2..................(25cM)........................3.5

The distance between 3 and 5 is 0.4 cM; and that between 1 and 2 is 0.6cM. Rest of the distances are given in the diagram above.

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