An Autosomal Dominant Mutant in Tribolium castaneum with Recessive Lethal Effects

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Abstract
A mutant called "Short Antennae " (Sa) found in an ir-radiated population of Tribolium castaneum reduces the number of segments in the funicle region of the antennae. The mutant s antennae are consistently 12-15% shorter than wild type. Results from test matings indicated that Sa was an autosomal dominant mutation with recessive lethal effects in that Sa x Sa matings produced mutant and wild type offspring closely fitting a 2:1 ratio as one would expect if the homozygote Sa/Sa were lethal. Reciprocal matings of Sa x wild type yielded a 1:1 ratio. Microscopic examination of unhatched eggs revealed that the lethal action of the Sa/Sa homozygote occurs largely in the early embryo.

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