do identical twins have exactly the same dna?
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It is true that identical twins share their DNA code with each other. This is because identical twins were formed from the exact same sperm and egg from their father and mother. (In contrast, fraternal twins are formed from two different sperm and two different eggs.)
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Identical twins are also known as monozygotic twins. They result from the fertilization of a single egg that splits in two. Identical twins share all of their genes and are always of the same sex.
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We think of identical twins as having identical DNA. After all, while huge differences can and do happen with fraternal twins, identical twins are usually exactly that -- identical in skin, hair and eye color. ...
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Yes! Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. ... As identical twins get older they may look more and more different, because they are exposed to more diverse environments. The science of epigenetics explains how these environmental influences can affect the genes.
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7.1 Two identical twins have exactly the same set of genes. They are separated at birth and grow up in different households. If a scientist were to study the twins as adults, would he find them to be identical in every way, since they have the same genes?
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Monozygotic twins are genetically nearly identical and they are always the same sex unless there has been a mutation during development. ... Monozygotic twins, although genetically very similar, are not genetically exactly the same.
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So identical twins are kind of like two pies made from the same recipe. They are more similar than pies made from different recipes, say apple and blueberry. But if you look closely, they are still not exactly the same. They will always have some physical differences due to differences in their environment.
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In case you don't see the differences between the twins above, or you don't believe that identical twins are not truly identical, it has been proven time and again that monozygotic twins have variations in their DNA sequences, their fingerprints are different, their weight and height can differ, their facial features ...
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Yes definitely if they are fraternal twins and, although much less common, it is also even possible if they are identical twins. ... For identical twins to have different blood types, something needs to happen to one twin's DNA. Small changes in DNA can and do happen so identical twins do have a few differences.
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It's not possible. Identical twins are completely identical. That's why DNA tests can't tell which twin is which. As their DNA are completely identical, their natural hair color will always be the same.
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​Identical Twins They result from the fertilization of a single egg that splits in two. Identical twins share all of their genes and are always of the same sex. In contrast, fraternal, or dizygotic, twins result from the fertilization of two separate eggs during the same pregnancy.
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Scientists have shown that identical twins have very similar marks when they are born. But, as they age, the marks in their DNA become more and more different. So even though identical twins have the same DNA, they are using it in different ways. ... Both the right and left side of your face were made using the same DNA.
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Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. ... So identical twins with identical DNA may have different genes turned on, causing them to look and act differently, and even to develop different diseases such as cancer.
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 Yes! The exact DNA sequence is duplicated/replicated during DNA synthesis so the sister chromatids are exact copies of each other for every single nucleotide. ... Homologous chromosomes have the same genes BUT remember those genes could be different alleles which are coded for by slightly different nucleotide sequences.
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They're called identical twins because their genomes are identical. But even though all of their DNA is the same, they clearly are not. ... DNA and RNA sequencing technologies have advanced to the point where allele-specific expression can now be quantified.
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Shiva Singh, molecular geneticist at The University of Western Ontario, have found that identical twins are not necessarily genetically identical. During normal reproductive development, a single cell forms by combining an egg, genetic material from the mother, and sperm, genetic material from the father.
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Identical twins share the same genotype, since their genomes are identical; but they never have the same phenotype, although their phenotypes may be very similar.