Final answer:
The Law of Bergonie and Tribondeau suggests that cells with a long mitotic phase would NOT be as sensitive to radiation since they are neither rapidly dividing nor undifferentiated.
Step-by-step explanation:
According to the Law of Bergonie and Tribondeau, not all cells have the same sensitivity to radiation. Sensitivity is largely determined by two main factors: the rate at which cells divide and their level of differentiation. The Law states that cells that are rapidly dividing (rapidly dividing cells) and those that are undifferentiated (undifferentiated cells) are more sensitive to radiation. In contrast, cells that are not currently dividing or are fully differentiated are less sensitive to radiation. Hence, among the options provided, 'Cells with a long mitotic phase' are those which would NOT be as sensitive to radiation, as they spend extended time in the mitotic phase of cell division rather than rapidly completing cell division or remaining undifferentiated.