Genetic diversity in partially selfing populations with the stepping-stone structure

• Published in: Heredity Vol. 77; no. 5; pp. 469 - 475
• Main Authors: TACHIDA, H, YOSHIMARU, H
• Format: Journal Article
• Language: English
• Published: Basingstoke Nature Publishing 01-11-1996
• Subjects: Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Genetics of eukaryotes. Biological and molecular evolution; Population genetics, reproduction patterns; Pteridophyta, spermatophyta; Vegetals; Mating system; Vegetals; Statistical analysis; Genetic variability; Partial; Self fertilization; Genetic diversity; Spermatophyta; Mathematical model; Population genetics
• ISSN: 0018-067X; 1365-2540
• DOI: 10.1038/hdy.1996.173

A method to compute identity coefficients of two genes in the stepping-stone model with partial selfing is developed. The identity coefficients in partially selfing populations are computed from those in populations without selfing as functions of s (selfing rate), m (migration rate), N (subpopulation size), n (number of subpopulations) and u (mutation rate). For small m, 1/N and u, it is shown that approximate formulae for the identity coefficients of two genes from different individuals are the same as those in random mating populations if we replace N in the latter with N(1-s/2). Thus, the effects of selfing on genetic variability are summarized as reducing variation within subpopulations and increasing differentiation among subpopulations by reducing the subpopulation size. The extent of biparental inbreeding as measured by the genotypic correlation between truly outcrossed mates was computed in the one-dimensional stepping-stone model. The correlation was shown to be independent of the selfing rate and starts to fall off as the migration rate increases when mN is larger than 0.1.