Figure 2.

ESTR mutation rates in the germ line of male (open boxes) and female (hatched boxes) parents. The dates are given for controls, F₀-exposed males, nonexposed females, and F₁/F₂ offspring of irradiated males. The 95% confidence intervals (CIs) for mutation rate estimated from the Poisson distribution and the probabilities of difference between male and female mutation rates in the F₁ and F₂ parents (Fisher's exact test, two-sided) within each generation are shown. The F₀ data for premeiotic exposure (6 weeks after irradiation) are shown.