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Genomics at a Glance (I): Molecular Markers & Genome Mapping,Used
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Genetic marker is any trait representing genetic differences between individual organisms or species. Generally, they do not represent the target genes themselves but act as signs or flags. Genetic markers that are located in close proximity to genes may be referred to as gene tags'. Such markers themselves do not affect the phenotype of the trait of interest because they are located only near or linked to genes controlling the trait. All genetic markers occupy specific genomic positions within chromosomes(like genes) called loci.There are three major types of genetic markers: morphological(also classical or visible) markers which themselves are phenotypic traits; biochemical markers, which include allelic variants of enzymes called isozymes; and DNA(or molecular) markers, which reveal sites of variation in DNA.DNAbased markers offer several advantages over traditional phenotypic and biochemical markers. DNAbased markers are less affected by age, physiological condition of samples and environmental factors. DNA based molecular markers have acted as versatile tools have found their own position in various fields like taxonomy, physiology, embryology,etc.
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