Summary
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1.
Pale cream of Upland or Sea Island White, and yellow of grades 1 to 7, form an allelomorphic pair of characters which may be represented by the factor pairY-y.
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2.
Segregation in inter-specific crosses is more complicated than in inter-Peruvian crosses, in that many intermediate grades of yellow are found inF 2. In the inter-Peruvian cross involving Sea Island White there is sharp segregation inF 2, with absence of intermediate grades.
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3.
Upland and Sea Island White are both geneticallyy, but Sea Island White, having arisen directly from the yellow form by a single locus mutation, possesses a series of plus modifiers for yellow, while Upland possesses fewer modifiers. Segregation of modifiers produces the intermediate grades of yellow.
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4.
The total number of modifiers is not known, nor has the attempt made to distinguish their specific effects been successful. Probably not less than 2 nor more than 7 modifiers are concerned.
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5.
The occurrence of grades lighter or darker than the parents in theF 2 of a cross between two yellows is considered to be due to new combinations of intensifiers.
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6.
Some Uplands have intensifiers capable of raising Sea Island from grade 4 to grade 6, but there is no ease where Upland has intensified the colour of a Bourbon variety.
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Harland, S.C. The genetics of cotton. Part III. The inheritance of corolla colour in New World cottons. Journ. of Gen. 21, 95–111 (1929). https://doi.org/10.1007/BF02983361
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DOI: https://doi.org/10.1007/BF02983361