Recently I heard something about some people having 2 sets of DNA.  Is this true or just pure nonsense?
117313
chimera - thats what people are called when they have 2 sets of DNA.  This occurs when one twin attempts to absorb the other in utero.\nthis will result in 2 sets of DNA.  Such as your hair may carry one set of DNA and your liver another.  I have seen this on TLC.  It showed a woman who was facing custody battles because her paternity tests were showing that her children werent hers - but they were, the DNA from the samples they took were not the DNA she passed down to her children.
600403
No; there are random / environmental factors at work, as well as heritable factors.\n\nThe % of loops and whorls in prints of fingers / toes is similiar in identical twins, but not identical in placement, nor in other fine detail.\n\nHey! look at your own left and right sides!  The exact placement of veins visible through skin eg at wrist and elbow, or exact fingerprints, is not the same when you compare your 2 sides!  They have identical DNA .... but those random factors affected them differently.
886695
no it can be from either parent and it was recently found that there was three different genetic links which can be traced through family's ruling out one single gene disorder
1053947
no, because it is a defect on human chromosome 21, where 3 copies are made instead of 2. this has never been seen to occur in the genomes of other organisms.
640492
i like the way you think man. the fact is howver that failure to reproduce is concidered unnatural HOWEVER! there could be a small overlooked message in the DNA that says once every so and so years people will be gay, to decrease the surplus population...i neer saw it that way im glad you enlightenemd mee
558247
Do they have the same fingerprints? "No," says Professor McCabe. Actually, it takes a while for these clumps of cells to get fingers, let alone fingerprints. So we're talking about on down the road a ways.\n         But still, how can this be? How can two people who have EXACTLY the same genes be different? After all, it's our genes that control everything about who we are and how we grow, right? So what's going on here?\n         Already when the embryos are in the womb, parts of their ENVIRONMENT are affecting what they'll be like, says Professor McCabe. Even though these babies are in Mom's womb at the same time and have exactly the same genes, many things can have different effects on each baby and can cause them to be different. For example, one baby may be getting a bigger part of Mom's blood supply and therefore more food than the other, so one identical twin may weigh more than the other at birth. Other effects include their position in the womb, Mom's mood, Mom's health, and so on.\n         Now, what about fingerprints? Can differences in blood supply give rise to different sets of fingerprints? Well, we don't really know, says Professor McCabe. (Sound familiar?) The difference could be due to many different environmental effects in the womb during the babies' development.\n         Other things about identical twins can be different. Professor McCabe showed me a picture of twin boys. Their hair whorls, the way the hair twists in a spiral pattern on the back of the head, turn in opposite directions! Here they are, absolutely alike (kind of), but their hair twists in opposite ways. What causes it? Who knows? \n        Whatever it is, it also makes other things different in these otherwise identical twins: the structure of their brains, for example, and how they think and learn.
1175155
I don't think it was their DNA. It was probably meant to mean just that they were happy and had no trouble with each other and they were cool. Then one day they were lead into temptation and the sinned and they were then separated from God somewhat... therefore they had to live without his help.
16328
DNA testing can be pretty accurate, but it depends on how many sequences they test.  If you read my test procedure explanation you will understand why DNA is used.\n\nFirst, Carbohydrates and lipids are pretty much identical between all people.  A few people have metabolic disorders that result in a build up of certain carbs, but generally it would be useless to test for the specific carb or lipid present, because they are the same for everyone.\n\nProteins do differ among people, but not as much as DNA does.  DNA provides the information telling ribosomes how to put proteins together in people, but only a small portion of DNA is ever tranlsated to protein.  Most of your DNA is junk, and the big DNA differences between two people are in this junk DNA, so that is what is used for DNA testing.\n\nThis is an explanation of how it is typically done:\n\nThe way DNA testing works is by measuring the lengths of DNA segments between two endonuclease cleavage sites.  An endonuclease is an enzyme that will cleave DNA at a particular sequence of bases.  Some specific cleavage sites exist in the DNA of all people.  In between two specific cleavage sites, you may have a sequence of tandem repeat DNA.  For example le us say your DNA looks like this:\n(Cleave) gene1-TGTGTGTGTGTG-gene2 (Cleave)\nWe will denote this length of tandem repeat segment as (TG)6.  My DNA may have a tandem repeat segment may be (TG)10, in which case the segment of DNA between the two cleavage points is longer for me than it is for you.  This additional length also makes it heavier.\n\nNow let us make a suspend lots of copies of this particular segment of your DNA in a fluid and make another suspension with my DNA.  \n\nLet us also say that we know that everyone has a sequence of TG repeats at least 6 repeats long.  The complement to this sequence is:\nACACACACACAC -> (AC)6\nWe could create a radio labelled (AC)6 probe and sprinkle it into the suspension with your DNA, the suspension with my DNA, and a suspension with unknown DNA.  This probe would bind to the DNA in all three solutions, but my DNA segment would still be heavier than yours, because it contains 10 repeats, even if only 6 are bound to the probe.\n\nWe now place some of the suspension of your DNA at a point on an adsorbent surface.  The suspnsion will travel along the surface, but at some point the DNA will stick to the surface.  If it is heavier it will stick sooner.  With good equipment all DNA of a certain length will stick at the same spot (or short line)\n\nSince my DNA is heavier than yours, mine will travel less far.  The unknown DNA will travel either as far as your DNA does or as far as my DNA does, and that will tell whose DNA it is.\n\nThe way you view the DNA on the adsorbent surface is with a film that will darken when exposed to our radio labelled probe.  You place this film on top of the adsorbent bed with the DNA samples and three small spots (or short lines) will show.  The distance the unknown DNA travelled in comparison to your DNA and mine tells us whose DNA it is.\n\nInvestigators do this with evidence; only they use many different tandem repeat segments scattered throughout the genome.  The more segments used, the lower the probability of a coincidence.
355921
Actually, if two people produce a child with Cystic Fibrosis then they are both carriers of the gene. That means that everytime they reproduce there is a 1 in 4 chance that their offspring will have Cystic Fibrosis. \n\nBasically, it is a genetic matrix. Each parent donates 2 genes to the process. Each parent has one healthy gene and one CF gene. There are four possible genetic combinations when two people with the Cystic Fibrosis gene have a child. \n\nThe child could get one healthy gene from each parent and the child will not develop Cystic Fibrosis. \n\nThe child could receive one healthy gene from his mother and one CF gene from his father and the child will not develop Cystic Fibrosis. \n\nThe child could receive one healthy gene from his father and one CF gene from his mother and the child will not develop Cystic Fibrosis. \n\nThe child could get one CF gene from each parent and the child will develop Cystic Fibrosis. \n\nThere are two important things to remember.\n\nFirst, if the child receives a CF gene from his parents he has the potential of passing that gene on to his children. This is especially true if he were to have a child with a woman who also carries the gene.\n\nSecond, this does not mean that if a couple were to have four children only one would be at risk of having Cystic Fibrosis. The odds start all over with each pregnancy. It's like having a little sack with 3 red marbles and 1 blue marble in it. If you take a marble from the sack and it is red but place the marble back in before you draw again, you have an equal chance of pulling that red marble the second time (just like the first time).
1127492
These types of DNA are used to create a much more accurate diagnosis of DNA samples lef tfrom teh crime\n\nemail me a kkstrong0@yahoo.com if you have further questions and ill try to tell you what i know
261054
That would be a violation of HIPPA, which provides protection for our medical records. I do believe that law enforcement officials can search for DNA matches of those who have given samples, but civilians cannot and, I believe, should not be able to. Your DNA is similar to those you are related to: your mother, father, siblings. Humans also share basic DNA sequences.
1103570
yes!  the only difference is finger prints (isn't that odd)\n\nlet me clarify: identical twins have the same DNA
429879
Each half of the double-helix sort-of "unzips" during replication.  Since each of the bases is kind of like a jigsaw-puzzle piece, the two strands can then wind back up, if supplied with the appropriate free bases, to form two identical copies of the original DNA strand.\n\nNeat, huh?
1003639
must be some sort of genetic freak - is it someone with two heads and several personalities?  i don't know...
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.
534422
No possible way of knowing that since nobody (I am quite sure) has gone back and tried to determine whether the particular DNA evidence used in all those cases was "accurate" or "inaccurate."  In general, however, it is my belief that when performed properly and correctly used, DNA evidence is virtually infallible.
145244
It is called Chimira(sp) one twin is absorbed into another and usually it is the semen or egg that has the different DNA.  the Saliva and blood are the actual person's DNA and the other is like a brother or sisters DNA