Question

In which phase of the cell cycle are sister chromatids available as template for repair?

• A. G${}_1$ phase
• B. G${}_2$ phase
• C. S Phase
• D. M phase

Answer 1

Answer: (B)

G${}_2$ phase

• A DNA strand can be repaired by the process of homologous recombination. Sister chromatids are present on a homologous chromosome.
• In the G${}_2$ phase, a broken sequence in a sister chromatid is repaired by the process of homologous recombination as the chromatids are available as a template in this phase.
  Thus the correct answer is option B.