If the radiation exposure occurs before DNA synthesis, the damage manifests:
If radiation exposure occurs after DNA synthesis (i.e., in G2 or mid and late S), only one arm of the affected chromosome is broken.
If radiation induced break occurs before DNA has replicated (i.e., in G1 or early S), the damage manifests in both arms (Chromosome aberration) at the next mitosis.
One arm of chromosome
Both the arms of chromosome
Shorter arm of chromosome
None of the arm of chromosome is affected