For the generation following Fukushima, it may be hard to predict the performance of individuals in the Japanese gene pool.
I'm not exactly sure what you mean by that, but radiation-induced deformities are not passed down through the genes. If a woman is pregnant during the exposure, then there is a strong possibility of fetal damage, but survivors of Hiroshima/Nagasaki, for example, didn't go on to have deformed children because of their exposure to radiation.