the basis of dna profiling- lqc 2a

Question 1

what can dna profiling also be known as

Answer 1

genetic fingerprinting and dna fingerprinting

Question 2

what does dna profiling rely on

Answer 2

every individuals dna is unique

Question 3

what does STR stand for

Answer 3

short tandem repeat

Question 4

where are STR sequences found

Answer 4

within introns

Question 5

describe STR features

Answer 5

short dna sequences repeated many times, they can contain 2-50 base pairs and can be repeated from 5-several hundred times

Question 6

describe what is special about the locations of STR sequences

Answer 6

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

Question 7

why are STR sequences analysed for a DNA profile

Answer 7

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