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Biology: DNA fingerprint, Genetics, Education, Discovery, and Technique



Biology: The fingerprints of each individual differ from another and can be used to identify them, the DNA fingerprinting technique is used to identify individuals.

Nowadays, DNA fingerprinting is also called DNA profiling.

The entire genome of a person isn’t sequenced in his technique.

Instead, certain portions of the genome have so much diversity dat getting a complete match with other people is almost impossible.

Except for monozygotic twins. Parents and offsprings have quite similar DNA profiles or fingerprints but not completely the same. Blood relatives will have a higher degree of similarity of DNA profiles than any random individuals.

These profiles are generated with the help of

  1. VNTRs (variable number tandem repeats) also called minisatellites, are composed of repeated sequences 10 to 80 nucleotide pairs long.
  2. STRs (short tandem repeats) also called microsatellites, are composed of repeated sequences 2 to 10 nucleotide pairs long.

These sequences exhibit highly variable copy number, making them ideal for use in DNA profiling.

A number of loci or gene locus are taken into consideration, whether VNTR or STR, for more accurate results.

dis technique is used for paternity testing and criminal profiling.

 DNA profiling provides a powerful forensic tool if used properly.

Profiles can be prepared from minute amounts of blood, semen, hair bulbs, or other cells.


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