IV. Summary
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1.
In hybrids between BritishTephrosia bistortata and melanic ContinentalT. crepuscularia the melanism behaves in inheritance as an ordinary Mendelian dominant.
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2.
This is unlike the state of affairs when the melanism is introduced by BritishT. crepuscularia var.delamerensis; then the melanism degenerates.
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3.
In spite of the fact that ContinentalT. crepuscularia is bivoltine the aberrant sex ratios observed in the crosses involving the univoltine British insect still persist.
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4.
As in the case of the same crosspairing when both species are of British origin, in the present crosses certain F1 hybrid females of parentagecrepuscularia female ×bistortata male deposited eggs developing parthenogenetically.
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5.
This yields experimental proof ofErnst's proposition that apogamy (parthenogenesis) owes its induction to hybridity.
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V. Literature quoted
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Heslop Harrison, J.W. The inheritance of melanism in hybrids between continental Tephrosia crepuscularia and british T. Bistortata, with some remarks on the origin of parthenogenesis in interspecific crosses. Genetica 9, 467–480 (1927). https://doi.org/10.1007/BF01508298
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DOI: https://doi.org/10.1007/BF01508298