INACTIVATION OF SPERM BY X-RADIATION IN HABROBRACON

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Abstract
Different [female][female] of an inbred stock were bred unmated or were mated to unrelated [male][male] which were either untreated or were X-rayed with 41,000 r or with 142,000 r. Matings with the same [male][male] were made for 9 or 10 days or, for the 142,000 r group, for only 5 days. Offspring per day from unmated [female][female] were 3.12 [male][male]; from [female][female] mated to untreated [male][male], 1.05 [male][male], 3.01 [female][female]; to 41,000 r [male][male], 1.41. [male][male] and to 142,000 r [male][male], 2.01 [male][male]. Fewer offspring from unmated 22 (3.12) than from mated controls (4.05) indicates recessive lethals. Increasing sons per day with increasing dosage indicates failure of some sperm to fertilize and thus to kill some of the eggs. Inactivation rather than exhaustion of sperm supply is indicated since there is no increase in sons from later matings.

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