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   Do identical twins share the same DNA?

   • While most identical twins do share almost completely identical DNA, some do not. Again, because the embryos develop independently after the zygotes split, identical twins can have different health conditions, physical differences, and other small changes that make each member of the pair distinguishable from the other.

   Do All Identical Twins Have the Exact Same DNA? - Healthline

   www.healthline.com/health/do-identical-twins-have-the-same-dna

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   Are identical twins always identical?

   • Then the zygote splits, creating two highly similar individuals with the same set of genetic instructions called the genome. (Fraternal twins, meanwhile, develop from separate eggs and are called dizygotic twins.) But as anyone who knows a pair of identical twins can tell you, they’re not always truly identical.

   Identical Twins: Just How Genetically Alike Are They?

   www.discovermagazine.com/the-sciences/identical-twins-just-how-genetically-alike-are-they

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   Are identical twins fraternal twins?

   • It has been reported that most parents of identical twins actually believe their children are fraternal twins because they are not identical in every way. As it turns out, “identical twins” is a misnomer. Monozygotic twins, as they should be called, are different in many ways, including in their DNA as a recent study confirms.

   Identical Twins Are Not Identical | McGill University

   www.mcgill.ca/oss/article/general-science/identical-twins-are-not-identical

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   Do identical twins have a stronger genetic basis than fraternal twins?

   • “If you look at fraternal twins and identical twins, and you see that identical twins share a trait at a higher rate than fraternal twins do, then you would say there's a much stronger genetic basis to it,” Robin says.

   Identical Twins: Just How Genetically Alike Are They?

   www.discovermagazine.com/the-sciences/identical-twins-just-how-genetically-alike-are-they

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   Do identical twins have the same sex?

   • Identical twins share the same genomes and are nearly always the same sex. In contrast, fraternal (dizygotic) twins result from the fertilization of two separate eggs with two different sperm during the same pregnancy. Like most other siblings, fraternal twins share half of their genomes.

   Identical Twins - National Human Genome Research Institute

   www.genome.gov/genetics-glossary/identical-twins

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   Why do twins have different lives?

   • An ongoing study of twins at King’s College in London has found that the many surprising differences in the lives of identical twins are largely due to the effects of a biological mechanism known as epigenetics. Epigenetics essentially functions through methylation, the process in which a chemical add-on called a methyl group binds to our DNA.

   Q&A: What causes differences between identical twins?

   www.yalescientific.org/2014/04/qa-what-causes-differences-between-identical-twins/

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2. www.healthline.com › health › do-identical-twinsDo All Identical Twins Have the Exact Same DNA? - Healthline

   www.healthline.com › health › do-identical-twins

   May 25, 2021 · So, whereas identical twins come from the same genetic material, fraternal twins do not. (Fraternal twins will have genes in common the way any siblings from the same biological parents do.)

3. www.livescience.com › identical-twins-dont-shareIdentical twins don't share 100% of their DNA - Live Science

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   Jan 7, 2021 · The study authors estimate that, in about 15% of identical twin pairs, one twin carries a "substantial" number of mutations that the other does not share. "That can be up to about 10 to 15 ...

4. www.discovermagazine.com › the-sciences › identicalIdentical Twins: Just How Genetically Alike Are They?

   www.discovermagazine.com › the-sciences › identical

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   Mar 3, 2021 · A better word for what we call "identical twins" is the technical one: monozygotic. That means both embryos come from the same fertilized egg, or zygote. That egg has already received a strand of DNA from each parent. Then the zygote splits, creating two highly similar individuals with the same set of genetic instructions called the genome.

5. www.verywellhealth.com › identical-twins-facts-5217452Identical Twins: DNA, Conception, Statistics, and More

   www.verywellhealth.com › identical-twins-facts-5217452

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   Sep 19, 2024 · However, experts believe that conceiving twins is affected by genetic and environmental factors. Identical twins make up about 3% to 4% of live births in the United States. The cause of having identical twins is usually unknown. Fraternal twins, on the other hand, may run in families. Fraternal twins make up about 6% to 8% of live births in the ...

6. www.genome.gov › genetics-glossary › identical-twinsIdentical Twins - National Human Genome Research Institute

   www.genome.gov › genetics-glossary › identical-twins

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   1 day ago · Definition. 00:00. …. Identical twins (also called monozygotic twins) result from the fertilization of a single egg by a single sperm, with the fertilized egg then splitting into two. Identical twins share the same genomes and are nearly always the same sex. In contrast, fraternal (dizygotic) twins result from the fertilization of two ...

7. www.mcgill.ca › identical-twins-are-not-identicalIdentical Twins Are Not Identical | Office for Science and ...

   www.mcgill.ca › identical-twins-are-not-identical

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   Jan 21, 2021 · Identical twins are known scientifically as “monozygotic twins.”. This Scrabble winner of a term refers to the fact that these types of twins arise when a single sperm fertilizes a single egg to form a zygote, and this zygote goes on to split into two masses of cells that give rise to the twins. By contrast, fraternal twins are essentially ...

8. www.yalescientific.org › 2014 › 04Q&A: What causes differences between identical twins?

   www.yalescientific.org › 2014 › 04

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   Apr 25, 2014 · An ongoing study of twins at King’s College in London has found that the many surprising differences in the lives of identical twins are largely due to the effects of a biological mechanism known as epigenetics. Epigenetics essentially functions through methylation, the process in which a chemical add-on called a methyl group binds to our DNA.