Most radio resistant phase in cell cycle:: (A) G1, (B) Early S, (C) Late S, (D) G2
Answer is C. Radiation energy is absorbed by tissue causing ionization or excitation, which are responsible for various biological effects. Susceptibility of various phases of cell cycle of radiation: G2M>M>G1> early S> late S phase Phase of cell cycle Comment G2M>G2 * Most sensitive to radiation End of S phase * Most resistant to radiation G1 * Radiation exposure leads to chromosomal aberration G2 * Radiation exposure leads to chromatid aberration