Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates
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 b...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2003-01-01
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| Series: | Scientia Agricola |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200015&tlng=en |
| _version_ | 1818978890769498112 |
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| author | Alexandre Siqueira Guedes Coelho Roland Vencovsky |
| author_facet | Alexandre Siqueira Guedes Coelho Roland Vencovsky |
| author_sort | Alexandre Siqueira Guedes Coelho |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-20T16:50:50Z |
| format | Article |
| id | doaj.art-4bbbc23ae1764f66906abc925e4a1c0c |
| institution | Directory Open Access Journal |
| issn | 1678-992X |
| language | English |
| last_indexed | 2024-12-20T16:50:50Z |
| publishDate | 2003-01-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Scientia Agricola |
| spelling | doaj.art-4bbbc23ae1764f66906abc925e4a1c0c2022-12-21T19:32:50ZengUniversidade de São PauloScientia Agricola1678-992X2003-01-01602305313Intrapopulation fixation index dynamics in finite populations with variable outcrossing ratesAlexandre Siqueira Guedes Coelho0Roland VencovskyUSPThe 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200015&tlng=enpopulation geneticsinbreedingcomputer simulation |
| spellingShingle | Alexandre Siqueira Guedes Coelho Roland Vencovsky Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates Scientia Agricola population genetics inbreeding computer simulation |
| title | Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates |
| title_full | Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates |
| title_fullStr | Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates |
| title_full_unstemmed | Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates |
| title_short | Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates |
| title_sort | intrapopulation fixation index dynamics in finite populations with variable outcrossing rates |
| topic | population genetics inbreeding computer simulation |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200015&tlng=en |
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