Inheritance of sex ratio in the Kanzawa spider mite,Tetranychus kanzawai Kishida |
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| Authors: | Akio Takafuji and Toshio Ishii |
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| Institution: | (1) Entomological Laboratory, College of Agriculture, Kyoto University, 606 Kyoto, Japan;(2) Laboratory of Applied Entomology, College of Agriculture, Okayama University, 700 Okayama, Japan |
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| Abstract: | Summary The frequency distributions in sex ratios of offspring from 4 fieldTetranychus kanzawai populations were examined. No significant difference was observed between average sex ratios of the 4 populations, although
there was a great variability within each population, especially in the population fromPueraia lobata. Using the population fromP. lobata, inbred lines with high (H) and low (L) sex ratios were selected. Crossing experiments between H and L showed that sex ratio
is determined by the genotype of mothers. It seemed that sex ratio is cointrolled by several genes, with no cytoplasmic factor
involved. |
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