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Lethals in finite populations.
1Department of Biology, Arizona State University, Tempe 85287-1501, USA. philip.hedrick@asu.edu
Summary
Population size impacts the frequency of lethal alleles, influencing inbreeding depression and the evolution of self-fertilization. Lethal genetic variation loss outpaces regeneration, affecting genetic diversity in small populations.
Area of Science:
- Population Genetics
- Evolutionary Biology
- Conservation Genetics
Background:
- Theoretical studies suggested lethal allele frequencies are independent of effective population size.
- Experimental studies estimated dominance levels for lethal alleles.
Purpose of the Study:
- To numerically investigate the dependence of lethal allele frequencies on finite population size.
- To assess the implications for inbreeding depression and self-fertilization evolution.
- To understand the impact on genetic variation in small or endangered populations.
Main Methods:
- Numerical simulations were employed to model allele frequencies.
- Analysis focused on lethals with varying levels of dominance.
Main Results:
- Lethal allele frequencies, especially those with low dominance, are dependent on finite population size.
- Loss of lethal genetic variation occurs faster than its regeneration by mutation.
- This asymmetry leads to lower standing genetic variation than predicted by mutation rates.
Conclusions:
- Finite population size significantly influences lethal allele frequencies and inbreeding depression.
- The rate of loss versus regeneration of lethal variation impacts genetic diversity.
- Findings are crucial for understanding endangered species and the evolution of mating systems.