Summary
The female: male sex ratio in litters born to C57 black mice immunized with male spleen preparations is 2∶1 and males were stillborn. In additionDrosophila busckii males are H-Y antigen positive. It is argued that H-Y is the primary testicular determinant and that this role is evolutionarily ancient.
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Pechan, P., Tracey, M. H-Y Evolution. Experientia 36, 356–357 (1980). https://doi.org/10.1007/BF01952324
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DOI: https://doi.org/10.1007/BF01952324