do the finger-prints,retina/iris scans of twins/triplets/quadruplets/etc... match???
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.
1140944
Apparently your ear-print is as unique as your fingerprints, so probably not that rare.  Nobody is perfectly symmetrical - they would probably look quite freaky if they were.
488041
No, fraternal twins have DNA that is as similar as brother and sister would be.  That's essential what they are, brother and sister (or sisters, or brothers), but simply born at the same time, since it is two separate eggs being fertilized by two separate sperm.
230862
yes, unless the two brothers are identical twins, that's the only way there would still be any question as to the real father, they could even tell by the one brother if the child is closely related which would then point to the other brother.
681386
Your "soul"?  What are they teaching in biology class these days? :-)\n\nLook, a person and their clone would be no more alike than two normally occuring identical twins.  In fact, genetically, that's exactly what a clone is ... just an identical twin.  They *look* alike, and may have some similar propensities (they may both be naturally talented at math, say) ... but other than that they are two completely independent human beings.  They will have different experiences ... that makes them different.\n\nAs for your "soul", biologists are happy to leave that to the spiritual folks.  Biologists have no opinion either way.
276856
No.  The children will be blessed with their own unique set of DNA, although they will probably look like siblings.
1062493
2 twins\n3 triplets\n4 quadruplets\n5 quintuplets\n6 sextuplets\n7 septuplets
1033894
pedigree, crossface , masterlock , FU etc
957887
Each chromosome in your body has an "identical pair"- there are two chromosomes that code for the same functions- one from your mother and one from your father.\n\nBecause they come from two sources, they are coding for the same functions, but may code differently for them (ie blue eyes as opposed to brown eyes).\n\nDuring prophase one, each chromosome duplicates into two sister chromatids joined by a centromere, and then the double stranded chromosome finds it's partner which is coding for the same thing (just came from the opposite parent), and is also double stranded.  Now you have a 4 stranded tetrad.\n\nGenetic variability comes from crossing over.  This is where the two chromatids closest together in the tetrad exchange some genetic information.\n\nFor example, two of the chromatids code for blue eyes, brown hair and shortsightedness.\nThe other two chromatids code for brown eyes, red hair and normal vision.\n\nDuring crossing over one chromatid from each pair forming the tetrad literally have ends "crossing over" and bits of information are exchanged.\n\nAfter crossing over, you have 4 chromatids with unique codings.  Using the example above, we may now have:\n-blue eyes, brown hair, shortsightedness\n-blue eyes, red hair, normal vision\n-brown eyes, brown hair, shortsightedness\n-brown eyes, red hair, normal vision\n\nWe now have genetic variability in each gamete produced from this meiotic division.
815639
DNA is in chromosomes. Chromosomes are in 23 pairs: 2 *different* copies of Chromosome 1, 2 different copies of C2, etc, in each person.  Whether you get your father's Chromosome 1 that he got from his mother, or the one he got from his father, is random with respect to which Chromosome 2 you get from your father. Same goes for your siblings. The chances of two nontwin siblings getting the same exact set of 23 5chromosomes from one parent are vanishingly small. The chances of siblings getting the same exact set of 23 chromosomes from EACH parent are .. well, it's essentially impossible. \n\nSame goes for the possibility that they would receive NO chromosomes in common - although it is theoretically possible to have siblings that share no genetic relation at all.\n\nDNA evidence is never 100% conclusive, but the tests that are widely used (if done properly) have such a small possibility of being wrong that they might as well be 100% conclusive. That's because there's just so much genetic material in any one person, it averages out ... makes it so that siblings are actually very close to 50% alike - even though they could be anywhere from 0 to 0% alike, in theory.
625549
looking for relatives via DNA
457615
yes - if the DNA sources were from the same individual - person.
753560
No..that's like asking if anyone who you went to school with shared the same last name as you if they were related to you. It's just coincidence
156462
Not really. You would be able to predict a few things, but reproduction is basically a reshuffling of the genetic cards, in which all the traits mother and father inherited are part of the deck, including recessive traits that may have been carried for hundreds of years without expression. What any child looks like depenmds entirely on what your hand looks like after the mother's randomly chosen cards and the father's are combined when the egg is fertilized. There are so many possible combinations that though a few things may be more likely than others, it's still the luck of the draw.
868605
They share just about everything - size, morphology (metacentric, submetacentric or acrocentric) and banding pattern at metaphase (see http://members.aol.com/chrominfo/geninfo.htm for a nice quick explanation of these things).\n\nWhat will not be shared will be minute variations in the exact sequence of the DNA, given that half of the sequence will orginate from the mother and half from the father. These genetic differences account for phenotypic (physical) differences following expression of all the genes and contribute to the fact that your parents are not identical.
308541
If you chose biometrics, you can compare and contrast retinal scanning, facial recognition and fingerprint scanning as biomarkers. Talk about how they can be used to identification in various situations: airports, high-security research facilities, etc.
760896
If the DNA samples applied to the autoradiogram come from both parents and the child, try comparing the distance traveled child's DNA fragments to that of both the mother and father.  There should be commonality to some degree if there is a relationship.  The more markers in common, the more likely the sire.