the basis of dna profiling- lqc 2a Flashcards
what can dna profiling also be known as
genetic fingerprinting and dna fingerprinting
what does dna profiling rely on
every individuals dna is unique
what does STR stand for
short tandem repeat
where are STR sequences found
within introns
describe STR features
short dna sequences repeated many times, they can contain 2-50 base pairs and can be repeated from 5-several hundred times
describe what is special about the locations of STR sequences
the same STR sequence occurs at the same locus on both homologous chromosomes. however the number of times the sequence is repeated on each of the homologous chromosomes differs
why are STR sequences analysed for a DNA profile
each person has a large number of introns with lots of STR loci, as there is a large amount of variation in the number of repeats for each STR sequence it is unlikely that two individuals will have the same number of repeats at every STR locus in their DNA. the profile will be unique for each individual
