Abstract
Production of a true zygotic dominant lethal effect by x-radiation of sperm (not conclusively demonstrable in organisms like Drosophila, in which biparental inheritance is the rule) is established for Habrobracon. Evidence consists of lowering of mean number of progeny per 2 per vial of [female][female] mated to x-rayed [male][male], and production of large numbers of small "unisexual" fraternities (quite distinct from ordinary unisexual fraternities which are regularly larger than bisexual).

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