A genetic marker is an observed inherited genomic state used to track chromosomes, test genetic association, or perform genetic linkage analysis. Genetic marker alleles need not themselves cause the phenotype. Several genetic markers on one nonrecombining region form a single observed haplotype.
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A genetic marker is a specific sequence of DNA that can be used to identify individuals, populations, or species, and indicates the presence of a particular gene or genetic trait. Genetic markers can be found throughout the genome and can vary among individuals, making them useful for various applications in genetics and molecular biology.