How do they figure out who did a crime from blood evidence?
2006-12-06 11:23:47 · 9 answers · asked by s_bodhi 3 in Science & Mathematics ➔ Biology
Red blood cells are anucleate in mammals, meaning they (red blood cells) have no nucleus, therefore no DNA.
http://en.wikipedia.org/wiki/Red_blood_cell
2006-12-06 11:32:58 · update #1
with the DNA from the white blood
2006-12-06 11:28:21 · answer #1 · answered by Anonymous · 1⤊ 0⤋
While is it true that red blood cells are anucleate, thus having no DNA, "blood evidence" will contain cells that do have DNA, such as white blood cells. And further, the red blood cells can be typed beyond the general ABO system to narrow the possibilities for the type of person.
2006-12-06 11:34:42 · answer #2 · answered by sonyack 6 · 0⤊ 0⤋
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this is because they lack a nucleus, which is where the DNA is found in other cells. Red blood cells also lack mitochondria which themselves have DNA. Therefore they not only lack nuclear DNA, but mitochondrial DNA as well. Red blood cells develop in your bone marrow from special cells called stem cells. These do have a nucleus, but as the red blood cell develops the nucleus is squeezed out. This makes more room for the red pigment hemoglobin, which is needed to carry the oxygen in the red cells.
2016-04-10 04:21:08 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Blood has more than red blood cells (which lack a nucleus and therefore genomic DNA). The white blood cells mentioned above, macrophages, platelets all have DNA.
2006-12-06 11:34:32 · answer #4 · answered by Dastardly 6 · 0⤊ 0⤋
DNA from white blood cells.
2006-12-06 11:30:02 · answer #5 · answered by Anonymous · 0⤊ 0⤋
There is no nucleus in red blood cells thus no DNA. However,white blood cells, a.k.a. leukocytes, contain nuclei and are the agents that provide a DNA profile from blood.
2006-12-06 11:38:35 · answer #6 · answered by john h 7 · 0⤊ 0⤋
Red blood cells are anucleate, but white blood cells are nucleate. So in a crime scene when blood is collected it doesn't matter if one type of blood cells doesn't have DNA, the lab can still identify who is guilty.
2006-12-06 11:37:58 · answer #7 · answered by yashira_quiles 1 · 0⤊ 0⤋
There is DNA in every cell in the human body. I think you're misinformed. Another explanation if in a blood sample there is probably more than just red boold cells present..
2006-12-06 11:26:46 · answer #8 · answered by ZEN MASTER 2 · 0⤊ 1⤋
Is There Dna In Blood
2017-02-23 07:07:53 · answer #9 · answered by klitzner 4 · 0⤊ 0⤋
Good question.
2006-12-06 11:26:17 · answer #10 · answered by Kayla [(Adam)] 4 · 0⤊ 0⤋