Explain dna fingerpronting technique class 12 biology 5 marks
Anonymous:
Fingerprinting
It should be datailed
Answers
Answered by
2
Technique for DNA Fingerprinting:-
(i) The DNA is extracted from the nuclei of white blood cells or of spermatozoa or of the hair follicle cells that cling to the roots of hairs that have fallen, or been pulled out.
(ii) The DNA molecules are first broken with the help of enzyme restriction endonuclease (called chemical knife) that cuts them into fragments. The fragments of DNA also contain the VNTRs.
(iii) The fragments are separated according to size by gel electrophoresis.
(iv) Fragments of a particular size having VNTRs are multiplied through PCR technique. They are treated with alkaline chemicals to split them into single stranded DNAs.
(v) The separated fragments of single stranded DNA are transfered onto a nylon membrane.
(vi) Radioactive DNA probes having repeated base sequences complementary to possible VNTRs are poured over the nylon membrane. Some of them will bind to the single stranded VNTRs. The method of hybridization of DNA with probes is called Southern Blotting, after the name of the inventor, E.M. Southern (1975). The nylon membrane is washed to remove extra probes.
(vii) An X-ray film is exposed to the nylon membrane to mark the places where the radioactive DNA probes have bound to the DNA fragments. These places are marked as dark bands when X-ray film is developed. This is known as autoradiography.
(viii) The dark bands on X-ray film represent the DNA fingerprints (= DNA profiles).
(i) The DNA is extracted from the nuclei of white blood cells or of spermatozoa or of the hair follicle cells that cling to the roots of hairs that have fallen, or been pulled out.
(ii) The DNA molecules are first broken with the help of enzyme restriction endonuclease (called chemical knife) that cuts them into fragments. The fragments of DNA also contain the VNTRs.
(iii) The fragments are separated according to size by gel electrophoresis.
(iv) Fragments of a particular size having VNTRs are multiplied through PCR technique. They are treated with alkaline chemicals to split them into single stranded DNAs.
(v) The separated fragments of single stranded DNA are transfered onto a nylon membrane.
(vi) Radioactive DNA probes having repeated base sequences complementary to possible VNTRs are poured over the nylon membrane. Some of them will bind to the single stranded VNTRs. The method of hybridization of DNA with probes is called Southern Blotting, after the name of the inventor, E.M. Southern (1975). The nylon membrane is washed to remove extra probes.
(vii) An X-ray film is exposed to the nylon membrane to mark the places where the radioactive DNA probes have bound to the DNA fragments. These places are marked as dark bands when X-ray film is developed. This is known as autoradiography.
(viii) The dark bands on X-ray film represent the DNA fingerprints (= DNA profiles).
Tqsm..but it isnt copied ryt?
Yeah!
I thought you need it urgently
That's why I do that
Thanks a lot
U copied
Welcome
:)
Sorry for that
Answered by
1
DNA fingerprinting is a way of identifying a specific individual, rather than simply identifying a species or some particular trait.
It is also known as genetic fingerprinting or DNA profiling.As a technology, it has been around since at least 1985, when it was announced by its inventer Sir Alleviate Jeffrey.
DNA fingerprinting is currently used both for identifying paternity or maternity and for identifying criminals or victims.There is a discussion for using DNA fingerprinting as a sort of personal identifier as well, although the viability of this is debatable.
It is also known as genetic fingerprinting or DNA profiling.As a technology, it has been around since at least 1985, when it was announced by its inventer Sir Alleviate Jeffrey.
DNA fingerprinting is currently used both for identifying paternity or maternity and for identifying criminals or victims.There is a discussion for using DNA fingerprinting as a sort of personal identifier as well, although the viability of this is debatable.
Explain the process
Similar questions