Summary
Partial suppression of the frizzled plumage of heterozygous Frizzles is induced by a recessive autosomal gene, mf, which is independent of the gene for frizzling.
This modifying gene is manifested when homozygous in all birds heterozygous for frizzling and in about 40 per cent. of those homozygous for frizzling.
Modified heterozygotes may show only a slight ruffling of the body feathers, but always have abnormal feathers in the primary remiges. Modified homozygotes have less curling of the feathers in all parts of the body.
The manifestation of frizzling is also apparently conditioned by growth rates of feathers, which vary with age, in different regions of the body and within certain feathers.
The modifying gene is widely distributed among domestic fowls, presumably because of its selective advantage in their ancestors.
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The greater part of this investigation was conducted at the University of Minesota, but the work was completed at Cornell University.
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Hutt, F.B. Genetics of the fowl. Journ. of Genetics 32, 277–285 (1936). https://doi.org/10.1007/BF02982682
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DOI: https://doi.org/10.1007/BF02982682