Genetic Fingerprinting Flashcards Preview

Biology - Unit 5 > Genetic Fingerprinting > Flashcards

Flashcards in Genetic Fingerprinting Deck (11):

What do introns contain repetitive sequences of?

DNA called core sequences that have a unique pattern


What is more similar in more closely related individuals?

The core sequences


The making of a genetic fingerprint consists of what 5 stages?

Extraction, digestion, separation, hybridisation and development


What is involved in extraction?

The DNA is extracted from a sample e.g hair or blood and its quantity is increased using the PCR


What is involved in digestion?

The DNA is cut into fragments using restriction endonucleases


What is involved in separation?

The fragments of DNA are next separated according to size by gel electrophoresis using an electrical voltage. The gel is then immersed in alkali in order to separate the double strands into single strands


In separation, once the single strands have been produced, what are they transferred onto and by what technique?

They are transferred on to a nylon membrane by a technique called southern blotting


What occurs during hybridisation?

Radioactive DNA probes are now used to label the fragments and bind with the specific core sequences


What occurs during development?

A membrane with radioactively labelled DNA fragments is placed onto an x-Ray film. The development of this film reveals dark bands where the radioactive DNA probes have attached


Name 3 uses of genetic fingerprinting?

Forensic science, paternity tests and in determining genetic variability within a population


What is genetic fingerprinting and what is it based on?

It is a diagnostic tool used widely in forensic science and is based on the fact that the DNA of every individual, except twins is unique