is dna the same in any cell of the human body?

Question

plz explain

Answer 1

in general yes, but in detail no. first, mature red blood cells and outer skin cells don't contain nuclei at all. second, sperm and eggs are mostly haploid and have gone through meiotic recombinations. third, the b cells and t cells of the immune system actively modify their dna by v(d)j recombination, and b cells further by class switch recombination and somatic hypermutation. fourth, it's estimated that just about every cell contains mutations due to ionizing radiation, aberrant repair events, oxidative free radical damage, among many other mechanisms. this is thought to be a major contributor to cancer. fifth, recent data suggests that there are large variations in the copy numbers of genes. sixth, retroviruses integrate their viral genomes into the host genomes of certain cells. seventh, dna itself is modified by cytosine methylation, where more methylated regions tend to be less active. there are different methylation patterns in different cells. there are probably more but those are just the ones off the top of my head.

Answer 2

All cells in your body (except egg or sperm) have the same DNA. Different areas just have different genes turned on or off. The thing people are talking about with one person having different DNA is called a chimera. These people can have multiple sets of DNA in different sections of their body.

Answer 3

Generally, yes. But different types of cells have different parts of there DNA active, to make different protein products. Some people have two different DNAs, these are called mosaics, different cells may have different DNA, eg, blood might be different to liver, but this is extremely rare, and is generally only seen on CSI television shows.

Answer 4

Yes with the exception of germ cells (egg, sperm), cancer cells (which have altered DNA), and chimeric individuals who are very rare and exist only when non-identical twins fuse and become one early in development or in a lab which to my knowledge has never been done with humans but has in other species. Also red blood cells in humans don't have chromosomal DNA.

Answer 5

The only exception would be differentiated reproductive cells (sperm and eggs) which have only half the chromosomal DNA of the person, all other cells should contain the complete DNA code, its just what parts of it they use that differentiates them.

Answer 6

some people have been known to have different sets of dna in different areas. its a rare genetic phenomenon though

Answer 7

No. If DNA was the same for everyone we'd all look exactly the same

Answer 8

I'm pretty sure it is, it's just that different parts of it are active in different parts of your body.

Answer 9

mitochondrial dna is different as well