A time series analysis of the population genetics of the self-incompatibility polymorphism. 2. Frequency-equivalent population and the number of alleles that can be maintained in a population

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes

External organisations

  • Operational Research Group
  • IACR Long Ashton Research Station
  • University of Bristol
  • Wolfson Lab. for Plant Molec. Biol.


The concept of a frequency-equivalent population is introduced, which is the panmictic population that has the same allele frequency distribution as a given population with overlapping generations and variation in plant size. It differs from the traditional concept of effective population size, N(c), in that the effect of variation in plant size is to make the frequency-equivalent population larger than the actual population, whereas the effective population size is smaller. Overlapping generations has the opposite effect. The number of alleles that can be maintained in a population at equilibrium is calculated incorporating these two factors, with variation in plant size significantly reducing the number of alleles and overlapping generations increasing the number of alleles that can be maintained.


Original languageEnglish
Pages (from-to)361-364
Number of pages4
Issue number4
Early online date1 Oct 1997
Publication statusPublished - Oct 1997


  • Effective population size, Mathematical theory, Population genetics, Seed dormancy, Self-incompatibility polymorphism, Variation in plant size