X-irradiation of theDrosophila male and its effect on the number of sperm transferred to the female
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Experiments were carried out to determine the number of sperm transferred by the maleDrosophila after X-irradiation. Acute doses (1000 r/min) of 5,000 r, 25,000 r and 50,000 r delivered to the male results in reductions of some 20–25%, 60–65%, and 85–90%, respectively, in the number of sperm scored in the ventral receptable of inseminated females. It appears, further, that sperm in ejaculates of relatively small size (50 or fewer) from irradiated as well as unirradiated males distribute themselves such that 20–50% or more found in the spermathecae. The bearing of this observation on the apparent 1:1 sperm: progeny ratio reported byPeacock andErickson (1965) from ejaculates with low sperm number is noted.
KeywordsAcute Dose Sperm Number Progeny Ratio Ventral Receptable Unirradiated Male
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