Question

 

What is Genetic polymorphism? Briefly discuss various genetic markers that exhibit polymorphism.

09 Jul 2025
Answer :
Word Count : 1192
Genetic polymorphism refers to the occurrence of two or more distinct alleles at a locus within a population's gene pool, where the least frequent allele has a frequency of at least 1%. It reflects genetic diversity within a population and plays a critical role in understanding evolution, inheritance patterns, susceptibility to diseases, and human population genetics. These polymorphisms can be observed at the molecular level and can involve single nucleotide changes, insertions, deletions, or even larger structural variations. In human population genetics, genetic polymorphisms are instrumental in studying gene flow, selection, mutation, drift, and the demographic history of populations. These polymorphisms serve as genetic markers, which are specific sequences in the genome used to identify individuals or species and to understand the genetic structure of populations. Various types of genetic markers exhibit polymorphism, and their applications range from mapping genes associated with diseases to studying ancestry and migration patterns. The main categories of polymorphic genetic markers include: 1. Single Nucleotide Polymorphisms (SNPs): SNPs are the most common form of genetic variation, involving a single base-pair change in the DNA sequence. For instance, a cytosine (C) may be replaced by a thymine (T) at a particular location in the ____ ________ ______ ___ _____ _______ _______ __________ _____ _______ ________.
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