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A genetic and cytological analysis ofOenothera pratincola and one of its revolute-leaved mutations

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Summary and conclusions

A new occurrence of mut.formosa together with the parental form,Oe. pratincola Etypica, and hybrids of both with other species were studied cytologically and genetically to determine the nature of the changes occurring when mut.formosa is produced.

The egg complex,α, oftypica was found to have chromosomes 1.2 (carryingR, the gene for red nerves), 3.4 (carryingp, non-punctate, and probably carrying the normal allelomorph off), 7.10, 8.9, 11.12, and either 5.14 and 6.13 or 5.13 and 6.14.

The pollen complex,β, oftypica was found to have chromosomes 1.4 (carryingf, the gene for revolute leaves), 7.8 and 13.14, with the remaining chromosomes undetermined but with the geneP s (punctate stems, striped bud cones) in the 3-end of a chromosome designated 3.x.

The egg complex of mut.formosa,f α′, was found to have five chromosomes in common withα oftypica, but chromosomes 1.2 and 3.4 have been replaced by 1.4 (carryingf) and 2.3 (carryingR andP s). In this replacement, chromosome 1.4 has come directly fromβ oftypica, while chromosome 2.3 represents a new chromosome made up of the 2-end of 1.2 fromα and the 3-end of 3.x fromβ.

The regular occurrence of mut.formosa with a frequency of about thirteen per thousand in the progeny oftypica is accounted for on the assumption that the mid-regions of chromosome 1.2 ofα and 3.x ofβ are homologous and occasionally cross-over. The distribution of such “interstitial segments” inOenothera chromosomes is discussed.

Further evidence is presented tending to show that mut.setacea is the homozygousβ.β segregant fromtypica, a conclusion already reached by Blanchard (1929).

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Authors and Affiliations

  1. Wm. G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology, USA

    Sterling Emerson

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  1. Sterling Emerson
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Additional information

A report of experiments conducted in part at the California Institute of Technology and in part at the Botanical Gardens of the University of Michigan. I wish to take this opportunity to thank Prof. H. H. Bartlett and Dr Frieda Cobb Blanchard of the University of Michigan for some of the material utilised, for the facilities placed at my disposal and for their general help and criticism.

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Emerson, S. A genetic and cytological analysis ofOenothera pratincola and one of its revolute-leaved mutations. Journ. of Genetics 32, 315–342 (1936). https://doi.org/10.1007/BF02982684

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