Top and bottom homologs both have 5 repeats. a cut is made, Ask an Expert

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Top and bottom homologs both have 5 repeats (each repeat is 500bp long). A cut is made in the middle of the top homolog (bottom homolog intact), after strand invasion and recombination the top homolog contains 7 repeats.
Can someone walk me through this explanation? Does it have to do with the way the holiday junctions are cut? How does the top homolog acquire 2 more repeating units?

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