Abstract
Observations of a significant female bias in one geographical strain of the rice weevil, Sitophilus oryzae L., stimulated a detailed investigation of sex ratio in three geographical strains. Sex ratios from intra-strain crosses were not usually biased, but certain inter-strain crosses were consistently associated with female biased sex ratios. Foodtype did not affect the sex ratio. Sex ratio bias was continued through generations and reciprocal crosses produced dissimilar sex ratios. A model of the genetic basis of sex ratio determination in S. oryzae was developed involving the interaction of a non-chromosomal, maternally inherited factor and a Y-linked factor. Evidence supporting Y chromosome involvement in the model and the similarity of certain features of the model to hybrid disgenesis in Drosophila were discussed.
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