Summary
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.
Similar content being viewed by others
References
Blakeslee, A. F. &Bergner, D. (1940).Yearb. Carneg. Instn,39, 207–8.
Bridges, C. B. (1936).Science,83, 210–11.
Brink, R. A. (1932).Amer. Nat. 66, 444–51.
Catcheside, D. G. (1935).Genetica,19, 134–42.
Catcheside, D. G. (1939).J. Genet. 38, 345–52.
Catcheside, D. G. (1940).Proc. Roy. Soc. B,128, 509–35.
Demerec, M. (1940).Genetics,25, 618–27.
Demerec, M. &Hoover, M. E. (1939).Genetics,24, 271–7.
Demerec, M. &Slizynska, H. (1937).Genetics,22, 641–9.
Dobzhansky, Th. (1936).Biol. Rev. 11, 364–84.
Dubinin, N. P. (1936).Biol. Zh. 5, 851–74.
Dubinin, N. P. &Sidorov, B. N. (1934a).Amer. Nat. 68, 377–81.
Dubinin, N. P. &Sidorov, B. N. (1934b).Biol. Zh. 3, 307–31.
Emerson, S. H. &Sturtevant, A. H. (1932).Genetics,17, 393–412.
Ephrussi, B. &Sutton, E. (1944).Proc. Nat. Acad. Sci., Wash.,30, 183–97.
Gowen, J. W. &Gay, E. H. (1933a).Proc. Nat. Acad. Sci., Wash.,19, 122–6.
Gowen, J. W. &Gay, E. H. (1933b).Science,77, 312.
Jones, D. F. (1939).Genetics,24, 100.
Jones, D. F. (1944).Genetics,29, 420–7.
Lea, D. E. &Catcheside, D. G. (1945).J. Genet. 47, 10–24.
Lewis, E. B. (1945).Genetics,30, 137–66.
Muller, H. J. (1935).Proc. 15th Int. Physiol. Congr., Leningrad.
Prokofyeva-Belgovskaya, A. A. (1945).C.R. Acad. Sci. U.R.S.S. 47, 360–2.
Roberts, L. M. (1942).Genetics,27, 584–603.
Saccharov, V. V. (1936).Biol. Zh. 5, 293–302.
Savchenko, P. F. (1935).Bull. Appl. Bot. Genet. Plant Breed. 8, 59–79 (Russ.) (Eng. Sum. pp. 183–9).
Schultz, J. (1936).Proc. Nat. Acad. Sci., Wash.,22, 27–33.
Schultz, J. (1941).Cold Spr. Harb. Symp. Quant. Biol. 9, 55–65.
Stadler, L. J. (1941).Cold Spr. Harb. Symp. Quant. Biol. 9, 168–77.
Stern, C. &Heidenthal, G. (1944).Proc. Nat. Acad. Sci., Wash.,30, 197–205.
Sturtevant, A. H. (1925).Genetics,10, 117–47.
Sutton, E. (1943).Genetics,28, 97–107.
Author information
Authors and Affiliations
Additional information
(With Two Text-figures)
Rights and permissions
About this article
Cite this article
Catcheside, D.G. TheP-locus position effect inOenothera . Journ. of Genetics 48, 31–42 (1947). https://doi.org/10.1007/BF02986095
Issue Date:
DOI: https://doi.org/10.1007/BF02986095