How is one person's genome different from another?
925111
Something like 99.9% of any two humans genomes are identical.  Most of the differences between any two peoples genomes are single base differences in the junk DNA (most of your DNA which doesn't do anything). It is really a small number of differences between people that make us each genetically unique and different from all others. Those are just very small differences in a lot of the genes that we all have.
730610
It's called genetics.\n\nCoach
1103570
yes!  the only difference is finger prints (isn't that odd)\n\nlet me clarify: identical twins have the same DNA
778145
http://www.pathlights.com/ce_encyclopedia/15sim03.htm\n\nsmall monkey (Macaca rhesus): 42 \n\n48 chimp chromosomes.\n\nhttp://www.ridgecrest.ca.us/~do_while/sage/v7i4f.htm\n\nBut the human DNA sequence was just recently decoded. (It was published in the 16 February, 2001, issue of the journal Science.) Work on decoding the DNA sequence of chimps is just beginning. (See Monkey Business, in the Evolution in the News column in this issue.) How could they have been able to calculate the similarity of two sequences “decades” ago when neither had been decoded? How can they calculate it now when only one of them has been decoded? Did they just pull 98% out of the air?\n\nPerhaps they compared the 46 human chromosomes with the 48 chimp chromosomes. They could not possibly have done that and come up with a figure exceeding 97.8% Here’s why:\n\nLet’s compare the chromosomes of a boy and his mother. A boy gets 23 of his chromosomes from his mother and 23 from his father. Clearly, at least 23 of the chromosomes will be identical to his mother. Therefore, the similarity will be at least 50%.\n\nBut one of the chromosomes he gets from his father must be different because his mother has two X chromosomes (if she didn’t, she wouldn’t be female), and the son has one X chromosome and one Y chromosome (because he is male). Therefore, at most, 45 of the 46 (97.8%) chromosomes will be identical.\n\nSo, the boy’s Y chromosome is guaranteed to be different from his mother. What about the other 22 chromosomes he gets from his father? Societies generally try to discourage incestuous relationships, and scientists have discovered that there is a good reason for this. It reduces the chance that a baby will inherit the same defective gene from both mother and father. If the boy’s father and mother come from unrelated families, it is almost certain that most of those 22 chromosomes will have at least one different gene.\n\nSo, if you determine genetic similarity by counting identical chromosomes, the genetic similarity of a boy to his mother is likely to be closer to 50% than 100%. “Scientists” certainly could not have found that humans and chimpanzees are 98% alike by counting chromosomes.\n\nOf course we know that they didn’t count chromosomes when making the comparison. We only mention it to make the point that what you count will affect the result you get. You can use a method of counting that gives close to 50%, or you can use a different method that gives a much higher number........\n\n\nclick on link to read more.
108939
One of the most obvious differences between the DNA of different species is the number of chromosomes.  If you have intact cells, you can do a DNA smash and stain and see how many chromosomes there are - for example dogs have 78 chromosomes, while humans have only 46.   Molecularly, there is no difference, besides a few genes which differ in sequence.
492162
its true that no two person can have the same DNA...\n\nbut the determination of parental disputes is not done by matching the DNA but by matching the small sequences present on the DNA known as Genes...\n\na collection of a set of genes on DNA is called chromosome..\n\nsince a child has 50% characteristics of both the father and the mother, he has the same set up of genes in his/her chromosomes.. on the chromosomes, there are many sites which are exclusive to that set of gene and chromosome and are known as VNTR's VARIABLE NUMBER TANDEM REPEATS...\n\nthese sites are very unique, they differ from person to person but remain in the same place in a lineage.... this very property of the genes on the chromosome containing DNA accounts for the determination of parental disputes..\n\n\nfor eg:   suppose in gene A, of Chromosome 1 ur mom has 5 VNTR alternatively and ur dad had 3...\n\nso if u a guy then u'll have the same 3 VNTR's on the gene containing chromosome..\n\nas simple as that..\n\nhope u got the point...
116048
same number but one is just mutated
617606
No.\n\nWhat this means is that on average you would have to test ten billion people to find an individual with the same genetic markers that the lab was testing for. Those odds have to do with the statistics of genetic variation, and have nothing to do with the number of people on earth.\n\nKeep in mind that it's still not strictly impossible that there isn't another person on earth with those same markers. For example, the odds of rolling a 5 on a 10 sided die is 1/10, but it still possible to roll a 5 on a single roll. \n\nIn fact, the odds that another person has the same markers should be 1-(10e9-1/10e9)^7e9, which if I kept appropriate track of errors comes out to about 50:50 that there is another person on earth with those same markers.
1116861
Actually, all life shares DNA to some degree. While primates may have less differences than humans, only 5% of DNA is different in each species. The other 95% is shared by all life.
81064
No. We don't even have that information for the human species as whole, much less for any individual.\n\nIf you have a few thousand dollars to spend you could get your genome sequenced completely. That stil wouldn't tell you what traits you have and wouldn't even tell you very much about what genes you have. But thatis the absolute best you can hope for.
73114
There is about a 1 in 10 billion chance that someone would have the same dna as you, unless you have an identical twin.  Scienctists don't like to say "never", but that's really close.
820365
A 'person' is identical to another 'person' if both consciousnesses encode the same information and follow the same process of consciousness, with the same sensory input.\n\nImagine instead of changing hair colour, the genetic change is a single nucleotide on a part of your DNA that has no effect on the functioning of your brain (literally no effect), then you as a person would theoretically develop exactly the same information in your brain, and your brain would function exactly the same, and your senses would be exactly the same, so you would be identical people.\n\nInterestingly, if you were a geneticist and examined the sequence of your own DNA, and looked at the nucleotide that is different (say G vs. T), then at that instant, your mind would no longer be identical to your 'other self's' mind, although they would be very very similar. And again, continuity has nothing to do with it.\n\n've also heard this 'Doppleganger theory'. I don't think that it it likely for the following reason: It is assumed that if we take a given individual and contrast that with the number of people on the planet that statistically speaking there should be a person who looks the same. However, this theory says a bit more than that- it says that every individual has a twin. So if you thought that a single person having a twin was unlikely, then just imagine the probablity that everyone has a twin.\n\nIn any case so what if we have a twin? I'm not sure that it would make any real difference to our lives. Moreover, if by twin we mean someone who looks like you then how precise does that similarity need to be? After all, they may have the same facial features as me, but they might have a different skin-colour, or maybe they have one leg shorter than the other.
541120
There is no difference, dear, both mean the same thing.  It's a disease in your genetic code, which you inherited.
26379
No, they've got different number of chromosomes and thus they are incompatable.
577414
sooo, i only share 50% of my DNA with my dad, whom i actually look like; and you want to tell me that this ape has more in common with me than my dad: whose genes i actually have?  your logic is screwed up.
641532
Its hard to see yes but if you think about it like this it makes sense.  It would be impossible to have different genes in each specialized cell.  This is because what do we start out as?  One cell.  The we go through a duplication stage where we make more cells identical to that cell.  So all of the cells in our bodies have the same DNA.  In order to specialize, our cells have to vary in gene expression because all of our cells have the same genetic material.
853788
It is genetic. The first source gives the information on a chromosomal difference and second and third sources are on brain differences, and the fourth source is on two identical twins raised in the same household with what appears to be different gender identities.