To determine whether radiation associated with the atomic bombings of Hiroshima and Nagasaki produced recessive germ-line mutations, scientists examined the sex ratio of the children of the survivors of the blasts. The best explanation for why an increase in germ-line mutations might be expected to alter the sex ratio is thatfemales will exhibit disproportionate lethality due to the presence of two X chromosomes, that is, more females than males are expected to die because of sex-linked recessive lethal mutations.females will exhibit disproportionate lethality due to the lack of the Y chromosome, that is, more females than males are expected to die because of sex-linked recessive lethal mutations that are not suppressed by the Y chromosome.males will exhibit disproportionate lethality due to the presence of one Y chromosome, that is, more males than females are expected to die because of sex-linked recessive l

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