DNA fingerprinting is possible because
- A. every person has a completely different genetic code
- B. only criminals have unusual DNA sequences
- C. DNA differs between the cells of one person's body
- D. the number of repeats in certain non coding sequences differs between individuals
Explanation
Short tandem repeats in non coding DNA vary greatly in number from person to person, so the pattern of band sizes is effectively unique except in identical twins. Half the bands of a child must match the mother and half the father, which is what makes paternity testing possible. The genetic code itself is the same in all people and indeed in all living things.
Related questions
A restriction endonuclease is used in genetic engineering to
The enzyme used to seal the gene permanently into the plasmid is
Human insulin for diabetic patients is now produced mainly by
The polymerase chain reaction is used to
In gel electrophoresis, DNA fragments move towards the positive electrode because