Figure 4.

Confirmation of linkage between Primula vulgaris Oakleaf and the S locus. A recombinant P. vulgaris Oakleaf thrum plant was used in a reciprocal back cross with a wild‐type pin plant. (a) Cross 3, Oakleaf as female parent. (b) Cross 4, Oakleaf as male parent. The phenotypes and genotypes, with respect to leaf shape (wild‐type or Oakleaf), and the S locus (pin or thrum) of parent plants are indicated. The phenotypes, and predicted genotypes, of F₁ progeny are shown along with numbers of progeny classified initially only with respect to leaf shape. The number of each class of progeny lost before flowering is shown, as well as the number of pin‐ and thrum‐type flowers found on Oakleaf and wild‐type plants. Based on data from Fig. 4, the Oakleaf parent used in this cross carries the OKL locus in coupling to the dominant S allele of the S locus; genotypes of recombinant chromosomes in progeny and numbers of recombinant progeny are shaded grey. The map distance in cM between OKL and the S locus are indicated.