Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates
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Data
2003
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Resumo
The intrapopulation fixation index ( f ) is inversely related to the outcrossing rate (t). Results
obtained from data on molecular markers of natural populations have shown that these values are highly
variable, even when measured in the same group of individuals. It is thus suggested that factors besides those
described in Wright s genetic equilibrium must be operating. Using simulated data sets this study shows that
the finite size condition of a population is sufficient to spread the estimated f values along a range at
equilibrium, as opposed to keeping them at the theoretical equilibrium point. The variation in outcrossing
rates can amplify this range considerably. Correlation between estimated f values obtained from different
loci in this condition showed to be negatively related to the outcrossing rates, and positively related to the
variance of these rates along generations. The finite size of populations associated to small fluctuations in t
mean values over time may explain the usually reported high variation among estimated f values of different
loci.
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Genética de populações, Endogamia, Simulação computacional, Population genetics, Inbreeding, Computer simulation
Citação
COELHO, Alexandre Siqueira Guedes; VENCOVSKY, Roland. Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates. Scientia Agricola, Piracicaba, v. 60, n. 2, 2003.