are all theDNA of human genome alike or they are different?if so why we get a single band in PAGE.?
491168
PAGE gels only seperate based on size- in general, genes are the same size between humans, even if there is genetic variability-most genetic differences between human genes are substitution mutations, in which one base is changes for another (often this doesnt change the actual amino acid composition of the resultant protein because of redundancy in the codon system). So, since the size stays the same, the band will run to the same level.  In addition, single base changes will not show noticable differences in size on PAGE gels.  To determine single bp differences, you really have to run a sequencing gel and read the bases.  Keep in mind, outside the variable, non-coding regions, there is very very little difference between humans.
271518
two copies of chromosomes ion the same cell
924396
It is very simple. Last band gives you that answer. You need to see G=G bond and it is follow by TAG. It is definatly eukaryotic.
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.
287732
Yes, there are two types of DNA: 1) Nuclear DNA (found in the nucleus) and 2) Mitochondrial DNA (obviously, found in the mitochondria).  Nuclear DNA consists of 23 pairs of chromosomes - 23 from mom and 23 from dad.  Mitochondrial DNA is received from your mom (whether you are a boy or a girl!).  Mitochondrial DNA is circular (nuclear DNA is linear), like bacterial DNA, which is one reason why it is thought that mitochondria may have originally been derived from bacteria.\nThere are only 13 genes in Mitochondrial DNA.  Nuclear DNA contains a lot more genes, with the latest estimates at about 23,000.
842928
base on theory, yes. but practicaly, the problem is the sample of DNA, there is complete DNA code or not.
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.
273434
There are multiple start codons, depending on the species.  But I'm pretty sure that there are always a few oddities in how different species might encode information is slightly non-standard ways.
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...
840381
Well the answer is all of the above, which is wrong.\n\nBoth single stranded and double stranded RNA molecules exist.   Single stranded and double stranded DNA both exist as well.\n\nThough in both cases, the less common variant (dsRNA and ssDNA) is usually viral.
789827
We are basically all the same.  Those small differences in DNA as a result of mutation (genetics) are what make us feel (and look) so different from one another.  But remember how tiny those DNA particles are...
1011098
we have cells.cells contain nucleus.nucleus has chromayin network.chromatin network is actually  chromosomes.chromosomes have  genes located on them at specific places called locus.these genes nothing but nucleotide sequences that determine our various characters like height,weight,eye colour etc.they contain codes for specific proteins in our body.any damage to it in the form of mutation we are affected by terriblre diseases.thats the long and short of it.
294442
the difference in DNA between humans is SUPER tiny, like in the hundreths of a percent different.  humans are approximately .001% different
1138370
That DNA of different sizes will migrate through a gel at different speeds.\n\nDNA is charged, so applying an electric current will cause the DNA to migrate down the gel, the smaller the piece, the faster it goes.  So you can separete pieces of different lengths, or estimate the size of your band by comparing to a standard ladder.
751115
dna of any person is as unique as the stripes on tiger skin.....so theres no ques to get confused.....and dna is present in the neucleus of cell of a person and the thing is that the nucleus is absent in blood cell so there s no fear of anykind that dna will change or sumthing else .....clear that theres no nucleus in blood cell n dna is present in nucleus only
230683
I respectfully disagree with the previous answer.\n\nGranted, X-Ray crystallography was used to discover the structure of DNA, but it was not used to sequence DNA.  Educated guesswork would not come close to sequence some billions of base pairs.  What is used is a "shotgun" approach, developed by Craig Venter (I hope I spelled that right) of Celera Genomics.  Essentially, it sequences random fragments of DNA, and a computer puts these fragments together into a sequence.  \n\n1. Between two random humans, ~99.9% of their DNA sequence will align.  Aside from the fact that sequencing one person's DNA would be impractical, one person probably wouldn't represent a "human" genome particularly well.  A group of volunteers was actually used in the Human Genome Project.  In other words, the current sequence used today is not from one person, but from many people.\n\n2. The genome was sequenced not as a random series of G's, A's, C's, and T's (I guess in a way it was), but it was sequenced with the intent to study various functional units --genes.  Funnily enough, most people's genes are pretty much the same.  Even more odd is the fact that a human gene that codes for a particular protein is typically nearly identical to homologous genes in other species.  Some proteins that we have even have homologies with bacteria and plants!  (Conclusion: DNA sequences between humans, and even between species, like chimps, are really really similar)\n\n3. This is not to say that everyone's DNA are exactly identical, but they are close enough where groups of volunteers could be used.     \n\n4. Just in case you're curious, even though our DNA and a chimp's DNA are almost identical, I don't know about you, but I'm not a chimp.  The reason for this (and the focus of much biology research today) is how our genes are regulated versus how a chimp's genes are regulated.  \n\nSorry for the long answer, but I really like this stuff.  It's what I do.
892921
The only difference between the DNA of white and black people is the DNA for pigmentation, which I think is about 6 or 7 genes. These 6 and 7 genes for pigmentation are different between all white and all black people, however all the other 1000's of genes are even distributed (on average) between people of different races. The fact is, all humans share the same genes, but different races have a greater frequency of different genes. Practically, on a genetic level, all humans are the same.