Abstract
IN mammals and in Drosophila, it has been found that F 1 incrosses are less variable than their parent inbred lines in respect of a number of characters1. In chickens, Shultz2 has reported an average reduction of environmental variance in egg shape, November egg-weight, and shank-length, in eight F 1's between lines with relatively low degrees of inbreeding (F between 38 and 58 per cent).
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References
See, inter alia, Claringbold, P. J., and Biggers, J. D., J. Endocrin., 12, 9 (1955). Lerner, I. M., “Genetic Homeostasis” (Oliver and Boyd, Edinburgh, 1954). Livesay, E. A., Genetics, 15, 17 (1930). Maynard Smith, J., and Maynard Smith, S., J. Genetics, 52, 152 (1954). McLaren, A., and Michie, D., J. Genetics, 54, 440 (1956). Robertson, F. W., and Reeve, E. C. R., Z. indukt. Abstamm.- u. Vererb.-lehre, 86, 424 (1955).
Shultz, F. T., Biometrics, 9, 336 (1953).
Yoon, C. H., Genetics, 40, 297 (1955).
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CLOUGH, M., COCK, A. Variability of Inbred and Incross Chickens. Nature 179, 1030–1031 (1957). https://doi.org/10.1038/1791030a0
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DOI: https://doi.org/10.1038/1791030a0
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