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Molecular markers are critical genetic components used to address different biological questions but are beholden to the genome at hand, a dynamic ecosystem with complex and non-uniform compositions and variable evolutionary scales at play. Different marker types—such as RFLP, SNPs, SSRs, and allelic variants—can provide insights at different levels of inter-relatedness, from broad taxonomic classifications to individual-level identification. The choice of marker depends on the specific research question and desired level of resolution. For instance, large-scale phylogenetic studies might use slowly evolving markers that have fixed states within entire clades, while population genetics often employ rapidly evolving markers to understand intra-species dynamics. The selection of appropriate molecular markers requires a fundamental understanding of the evolutionary scale, inheritance patterns, and population dynamics of the genetic markers in question. In this talk, I will discuss the utility of different genetic markers and their applications with lion’s mane (Hericium erinaceus) as an example. I will cover different examples on how markers have been used properly and how they have been used improperly for botanical identification for commercial products. Choosing the right molecular marker is crucial for accurately addressing the specific evolutionary or genetic question being investigated.
