Almost at once, when the studies began, it turned out that mice were more susceptible to genetic damage than fruit flies were. - hackernoonbooks projectgutenberg
The induced mutation rate per gene seems to be about fifteen times that found in Drosophila for comparable X ray doses. The only safe course for mankind then is to err, if it must, strongly on the side of conservatism. Once we have decided what might be safe on the basis of Drosophila studies, we ought then to tighten precautions several notches by remembering that we are very likely more vulnerable than fruit flies are.
This proved to be not so in the case of mice. In male mice, a radiation dose delivered at the rate of 0.009 rad per minute produced only from one-quarter to one-third as many mutations as did the same total dose delivered at 90 rads per minute. To check which of the two possible explanations was nearer the truth, Russell performed similar tests on female mice. In the female mouse the egg cells have completed almost all their divisions before the female is born. There are only so many cells in the female gonads that can give rise to egg cells, and each one gives rise to only a single egg cell. There is no possibility of damaged egg cells being drowned out by floods of undamaged ones because there are no floods.
If this is also true in the human being , then the greater vulnerability of our genes as compared with those of fruit flies is at least partially made up for by our greater ability to repair the damage.
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