• D. de Winton

      Articles written in Journal of Genetics

    • Genetics ofPrimula sinensis

      R. P. Gregory D. de Winton W. Bateson

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    • Linkage in the tetraploidPrimula sinensis

      D. de Winton J. B. S. Haldane

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      An account is given of six types of linkage observed between three pairs of factors in the tetraploidPrimula sinensis, and of a seventh theoretically possible type.

      The intensity of linkage is nearly, but not quite, the same in the tetraploid as in the diploid. It is the same on the two sides in the tetraploid.

      As regards the factors considered, there is no evidence of crossingover involving more than two chromosomes at a time, or of two chromosomes going to the same pole after crossing-over.

      The six readily available gametic series contain only one adjustable constantp, and since the experimental results in other cases agree reasonably well with prediction whenp has been calculated from the results of single coupling, this affords substantial support of the chromosome theory of inheritance.

    • The genetics ofPrimula sinensis - II. Segregation and interaction of factors in the diploid

      D. De Winton J. B. S. Haldane

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    • The genetics ofPrimula sinensis - III. Linkage in the diploid

      D. De Winton J. B. S. Haldane

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      1. Fifteen factors have been located on four out of the twelve chromosomes. Some other linkages are suspected, and a new case of multiple allelomorphism or very close linkage is described.

      2. As compared withDrosophila, interference is definitely less marked, though it certainly occurs.

      3. In two regions linkage is tighter on the male than on the female side, in two looser, while in two others it is nearly the same. Apart from this the figures are inadequate for a judgment.

      4. In one chromosome the genetical data from the tetraploid permit the rough location of a spindle attachment.

      5. The linkage values found in different families show a remarkable constancy.

      6. New mathematical methods are given for dealing with goodness of fit, combination of linkage data, and allowance for double cross-overs when mapping.

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