Not identical twins have exactly the same DNA?
The father of my son ran away before giving birth, and now I find his twin brother. They told me that twins have the same DNA, and that if a DNA test was carried out on my son and sister from his father that suggests not only that they were related, but show uncle and father. Is this true?
Unfortunately, the previous answers are not entirely correct. Identical twins are monozygotic, the which means they have developed from a single fertilized egg. Having formed from a single cell, each of which then divides to form a complete embryo, each individual must share the same DNA needs! This is true for nuclear DNA and, as far as I know, the mitochondrial DNA. There is no DNA test to distinguish between identical twins in this information alone. Therefore, your child's uncle is a way of speaking, as the biological father of her child, even if paternal DNA actually paid by his twin brother. They are primary genotypes (identical genetic background) and can not be changed. Identical twins, however, may be phenotypically different because different genes can be activated for any reason during development and beyond and secondary characteristics may also be due to environmental factors etc. There is also a common fact that identical twins are mirror images of each other copies, instead of carbon and have different fingerprints An interesting fact is that cloned organisms also share the same nuclear DNA but different mitochondrial DNA. This follows the technique of cloning itself. By replacing the core of an egg with a complete core of a donor, the resulting hybrid cells actually form a copy or a clone of the donor nucleus, however, each cells of the body resulting also include non-nuclear foreign genetic material of the original egg. The difference between nucleus and cytoplasm of cells cloned is a theory behind the failure of cloning as a viable method of reproduction. Http: / / en.wikipedia.org / wiki / genotype-phenotype_distinction Muqit MM, AJ Larner, G. Sweeney, C Sewry, VJ Stinton, MB Davis, DG Healy, SJ Payne, K Chotai, NW Wood, Lane RJ. The mitochondrial DNA deletions multiple monozygotic twins with OPMD. J Neurol Neurosurg Psychiatry. 2008 Jan; 79 (1) :68-71. Epub 2007 June 5.
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