Interstitial deletion

The nucleus of all eucariotic cells contains the carrier of the genetic information in the chromosomes. It is possible to visualize the chromosomes and analyze their number and pattern during a special period of cell division (the metaphase). Alterations from their normal shapes are observed as structural chromosome aberrations. These are chromosome type aberrations (terminal and interstitial deletions, dicentrics and rings), chromatid aberrations (gaps, breaks and exchanges) and sister chromatid exchanges. Spontanous frequencies of such chromosome... 

Figure 1. Total chromosome type aberration frequencies (sum of dicentrics, terminal and interstitial deletions) in the population of Badgastein.

This is the damage to chromosomes, resulting in large scale aberrations, including strand breaks and displacements, terminal and interstitial deletions of segments, rearrangements, and exchange between chromosomes. 

The special method of copying the instruction in B2 to the rest of the sheet is used here merely to keep the unused, interstitial spaces from filling up with zeroes, and thereby cluttering up the screen. Verify that you will indeed get the same result, but with zeroes in all the unfilled spaces, by deleting instruction (3), and by then simply copying the instruction of cell B2 to block B2 X12. 

---