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Genic basis of the mate-killer trait in Paramecium aurelia, stock 540

Published online by Cambridge University Press:  14 April 2009

I. Gibson  and
G. H. Beale
I. Gibson
Affiliation:
Institute of Animal Genetics, Edinburgh, 9
G. H. Beale
Affiliation:
Institute of Animal Genetics, Edinburgh, 9
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1. Stock 540 of Paramecium aurelia (syngen or variety 1) contains two duplicate genes M1 and M2, each of which is capable of supporting growth of mu particles in the cytoplasm, thus producing the mate-killer phenotype.

2. Of six sensitive stocks of P. aurelia syngen 1, collected from widely separated localities, none contained either M1 or M2.

3. One sensitive stock (544), though proved to contain both recessive genes m1 and m2, gave aberrant ratios of mate-killers and sensitives following hybridization with stock 540. Evidence has been adduced consistent with the hypothesis that the m1- and m2-bearing chromosomes are involved in a translocation, by comparison with stock 540.

4. There is a proportionality between numbers of M genes and speed of killing, and presumably therefore with the number of mu particles.

5. Loss of mu particles following substitution of M genes by their recessive alleles occurs at times varying between eight and fifteen fissions after change of genotype.

Type
Research Article
Information
Genetics Research , Volume 2 , Issue 1 , February 1961 , pp. 82 - 91
Copyright
Copyright © Cambridge University Press 1961

References

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