that's called teratogenesis, damage of a normal fetus, and that's what that drug thalidomide did when women took it for morning sickness and their babies were born with no arms or no legs. it does that. it also--plutonium in particular, which is highly mutagenic--lodges in the testicles. so it has a predilection for testicles, and it lodges next to the spermatogonia, the cells that form the sperm, the precursors, and it's an alpha emitter, highly mutagenic. so it can mutate genes in the sperm to induce genetic mutations and genetic disease down the generations. now, there are two sorts of mutations, dominant-- so if you have a baby with a dominant mutation like brown eyes, the baby will have brown eyes, or dwarfism-- achondroplastic dwarfism is dominant--but most mutations are recessive like blue eyes. you have to have two genes to have blue eyes. because if you have a brown-eye gene and a blue-eye gene, you're going to get brown eyes. or cystic fibrosis is recessive, or diabetes or many, and it takes up to 20 generations for recessive mutations to express themselves. so we're talking