Describe how genetic fingerprinting is carried out? (example of 6-mark question)

Every individual's DNA sequence is different and genetic fingerprinting can be used to distinguish individuals based on their unique DNA sequence. To begin, DNA needs to be extracted from a sample, which could be either blood, skin or hair follicle. DNA is cut into segments using restriction endonucleases whilst also leaving intact micro-satellites. DNA probes complementary to micro-satellites are added. The mixture pipetted into wells on gel and an electric current is passed through enabling the separation of DNA fragments by gel electrophoresis. X-ray film is used to identify the areas with the probe and therefore identify the unique pattern of fragments.

FH
Answered by Fabiola H. Biology tutor

6286 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Formation of phosphodiester bond


How does the polymerase chain reaction (PCR) work?


Explain how sucrose is transported from the phloem to the sieve tube element. (5)


Why is ATP produced continuously in such large quantities?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences