• The genetics of cotton. Part III. The inheritance of corolla colour in New World cottons

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    • Abstract


      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.

      2. Segregation in inter-specific crosses is more complicated than in inter-Peruvian crosses, in that many intermediate grades of yellow are found inF2. In the inter-Peruvian cross involving Sea Island White there is sharp segregation inF2, with absence of intermediate grades.

      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.

      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.

      5. The occurrence of grades lighter or darker than the parents in theF2 of a cross between two yellows is considered to be due to new combinations of intensifiers.

      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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  • Journal of Genetics | News

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