Mapping Mendelian traits in asexual progeny using changes in marker allele frequency

Area of Science:

• Genetics
• Quantitative genetics
• Population genetics

Background:

• Marker-assisted selection is crucial for identifying genes influencing traits.
• Asexual progeny allow for multi-generational selection to identify extreme phenotypes.
• Genotyping costs can be reduced using pooled samples.

Purpose of the Study:

• To analyze the method of measuring phenotype in asexual progeny.
• To examine marker allele frequency changes due to selection over many generations.
• To determine the impact of initial population size on marker frequency stochasticity.

Main Methods:

• Analysis of marker allele frequency differences in extreme progeny.
• Modeling changes in marker frequency over multiple generations of asexual reproduction and selection.
• Derivation of marker frequency distribution under selection at a single major locus.

Main Results:

• Stochasticity in marker frequency arises from finite initial population size.
• Selection over many generations can alter marker allele frequencies.
• Initial population size significantly impacts the reliability of marker-trait association studies.

Conclusions:

• Asexual progeny selection requires careful consideration of population size.
• Initial population sizes in the low to mid-hundreds are recommended to avoid spurious marker frequency changes.
• This method provides insights into genetic linkage and selection dynamics in asexual populations.