12th Class Biology Molecular basis of inheritance

  • question_answer 48)   What is DNA polymorphism? What is it important to study it?


                      DNA polymorphism refers to the variation in DNA arising through mutation at non-coding sequences. A special type of polymorphism, called VNTR (Variable Number of Tandem Repeats), is composed of repeated copies of a DNA sequence that lie adjacent to one another on the chromosome. Since, polymorphism is the basis of genetic mapping of human genome ,therefore, it forms the basis of DNA fingerprinting too. The single nucleotide polymorphisms are used in locating diseases and tracing of human history as well as in case of paternity testing.

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