Linkage disequilibrium causing selection at a neutral locus in pooled Tribolium populations

Area of Science:

• Population genetics
• Insect genetics
• Evolutionary biology

Background:

• Linkage disequilibrium (LD) is crucial for understanding allele frequency dynamics.
• Newly established polymorphic populations offer insights into evolutionary forces.
• Marker loci can reveal underlying selective pressures.

Purpose of the Study:

• To investigate the role of linkage disequilibrium in allele frequency changes.
• To determine the selective neutrality of the black locus in Tribolium.
• To evaluate models of selection acting on linked and non-linked loci.

Main Methods:

• Experimental evolution in Tribolium populations.
• Monitoring allele frequencies at the black marker locus.
• Statistical evaluation of different selection models.

Main Results:

• The black locus was found to be selectively neutral under experimental conditions.
• Several potential models of selection were tested and partially excluded.
• Model C, involving multiple linked and non-linked fitness loci, best explained the observed results.

Conclusions:

• Selection acting on linked and/or non-linked loci is a significant factor in allele frequency changes.
• The history of laboratory stocks influences the best-fit model for selection.
• Further evaluation of complex genetic architectures is warranted.