Red blood cells contain no DNA. During differentiation that right was given up in order to be able to carry oxygen and sustain hemoglobin. Then how is it possible to use someone's blood to identify them? Blood type is not enough to identify a person.
2007-10-02 17:15:28 · 9 answers · asked by Noncyclicphotophosphorylation 2 in Science & Mathematics ➔ Biology
You forgot about the white blood cells. Also, forensics is the word you were looking for.
2007-10-02 17:18:30 · answer #1 · answered by Michael da Man 6 · 1⤊ 0⤋
Ok, its based on the chemistry of forensic science. There is more than just red blood cells that create a specific blood pattern. These genetic patterns (DNA) are so specific that the only chance of anyone having the same pattern are identical twins. Of course, one needs to realize that the DNA being questioned, needs to also have a test sample to be compared to. These are different when it comes to blood analysis at a crime scene, or a mere mouth swab in estab. custody and mistakes can be made, but are extremely, extremely, unlikely. In the case of blood typing, your right, the type of blood you have can't identify you, I'm A-, what does that prove or show? Not much, its the genetic markers we all have, just like our finger prints that identify us each individually.
2007-10-02 17:28:04 · answer #2 · answered by ladilasvegas 2 · 0⤊ 0⤋
Since blood also contains white cells and plasma, there are plenty of sources of DNA there. However, there are many other abnormal conditions of red blood cells that could assist in forensically matching a donor (perpetrator) to a victim or crime scene.
2007-10-02 17:20:59 · answer #3 · answered by RayeKaye 6 · 0⤊ 0⤋
DNA is extracted from blood using various enzymes. This is usually done from the Buffy layer which contains white cells. This is then purified. DNA of human beings is very similar however there are various sites in which there are random repeats known as Variable number tandem repeat. These repeats can vary depending on the which repeat this is. Depending on the allele it can be from 14 to 100. The Variable number tandem repeat form patterns which can be recognized and differentiated from each other. When forensic testing is done it is usually done on one or more of these repeats patterns are matched to give the persons identity.
For more info visit
http://en.wikipedia.org/wiki/variable_nu...
http://en.wikipedia.org/wiki/forensic...
2007-10-03 14:11:41 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Red blood cells do not contain DNA, but white blood cells do. That is how they identify someone.
2007-10-02 17:19:45 · answer #5 · answered by Anonymous · 1⤊ 0⤋
Agreed, white blood cells along with blood typing and other evidence such as hair (which also contains DNA).
2007-10-02 17:23:20 · answer #6 · answered by Katie T 4 · 0⤊ 0⤋
Forensics?
I'm watching " Dexter " on TV.
He does Blood Analyst.
It's TV, but go to his Site.
He talks alot about blood.
I looked up DNA, it's the
organic substance found in chromosomes.
* DNA has hereditary information, from
generation, to generation.
Look it up, there's alot to it.
2007-10-02 18:01:06 · answer #7 · answered by elliebear 7 · 0⤊ 0⤋
because there is also plasma in blood wich contain protians that carry sections of dna and ech person has a different combination of protians
2007-10-02 17:20:25 · answer #8 · answered by tyler g 1 · 0⤊ 0⤋
maybe they use the white cells
2007-10-02 17:19:44 · answer #9 · answered by Anonymous · 1⤊ 0⤋