034-2015

MO640 - Multiple-choice question

Let b and c be the number of breakpoints and cycles, respectively, as defined by the breakpoint graph G for two genomes, with caps and disregarding common adjacencies. Consider the following cases for the DCJ operation, as defined in the original DCJ paper:

1. Cutting two black lines belonging to different cycles and then joining the extremes
2. Improper joining
3. Proper joining with nonconsecutive black lines
4. Proper joining with consecutive black lines in a cycle with two or more black lines
5. Proper joining with consecutive black lines in a 2-cycle

In which of the cases above, performing the DCJ operation would decrease c?

1. Just in I and V
2. Just in II and IV
3. Just in I, III and V
4. Just in II, III and IV
5. None of the above.

Original idea by: Juan Felipe Hernández Albarracín.