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Crop Science Abstract -

Spread of an Undesirable Gene in Populations of Phaseolus lunatus L.1


This article in CS

  1. Vol. 7 No. 6, p. 619-621
    Received: June 5, 1967

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  1. C. L. Tucker,
  2. Timothy Prout and
  3. James Harding2



An experimentally purified population of Phaseolus lunatus L. ‘Concentrated Fordhook’ was used to estimate the recurrent mutation rate of the recessive allele w to the dominant allele W. No mutations were found in the sample of 387,684 gametes tested and the maximum possible mutation rate was estimated to be 1.5 × 10−5. The frequency of the dominant allele was estimated in a commercial (unpurified) population and found to be 3.1 × 10−3. A mathematical analysis indicated that this maximum recurrent mutation rate could not account for the spread of the undesirable W allele in commercial populations of Concentrated Fordhook. A minimum selective advantage of 11% for the WW genotype was proposed and the disparity between this estimate and the previously reported estimate of a 40 per cent disadvantage was discussed.

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