Journal of Genetics

, 48:31 | Cite as

TheP-locus position effect inOenothera

  • D. G. Catcheside


InOenothera blandina, the genesP s ,P r andS produce a variegated phenotype when they are present in the interchange chromosome 3.11. When transferred by crossing-over to a normal 3.4 chromosome, they produce normal phenotypes. The variegation is therefore a position effect.

The break is 1·7 units from theP locus and 8·5 units from theS locus, indicating a considerable spread of the position effect along the chromosome. The action is thought to depend on translocation of theP andS loci to the neighbourhood of heterochromatin.

Theories of the mechanism of position effect are considered, but theOenothera case adds nothing new to the solution of the problem.


Pollen Tube Position Effect Abnormal Position Homologous Part Variegated Phenotype 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Indian Academy of Sciences 1947

Authors and Affiliations

  • D. G. Catcheside
    • 1
  1. 1.Botany SchoolCambridge

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