Abstract
FROM X-ray studies, it is known that the rates of chromosome aberrations vary with the age of the males1 and the time from irradiation to insemination2. Luning3 showed that these variations were due to differences in the rates of chromosome breaks in different stages of Spermiogenesis and that in spermatids there was a higher rate than in mature spermatozoa. After Baker and Von Halle's4 observation that there was a difference in the rate of dominant lethals in sperm between the first and second day, this was further studied by Luning5 on other types of aberrations. He proposed that this difference was due to a difference in the rate of breaks in ‘mature’ (the first-day) and ‘near mature’ (the second-day) sperm. This conclusion ought, however, to be revised as some yet unpublished experiments have shown.
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