Genome-wide association study (GWAS) is to sequence each individual in a population with rich genetic diversity combined with the phenotypic data of target traits to perform genome-wide association analysis based on certain statistical methods, which can quickly obtain the chromosome segment or gene locus that affect the phenotypic variation of the target trait. GWAS is not affected by the reference genome, which can quickly and accurately realize the efficient positioning of multiple target trait genes. It has the advantages of "wide sources of materials, abundant genetic variations, and comprehensive character positioning", and has been widely used in many species. According to different species and different characteristics of genome, sequencing of each individual can be accomplished by different sequencing methods.
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