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.
Volume 100, 2021
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