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   Are identical twins the same?

   • While they may look alike, identical twins are unique individuals with their own personalities and interests. Identical twins, also known as monozygotic twins, share the same egg at conception and are always either both boys or both girls. Fraternal twins, also known as dizygotic twins, come from two separate eggs fertilized at the same time.

   Identical Twins: DNA, Conception, Statistics, and More - Verywell Health

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

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   How many twins are identical and non-identical?

   • One-third of all twins will be identical and two-thirds non-identical. Identical (monozygotic) twins happen when a single egg (zygote) is fertilised. The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys.

   Pregnant with twins - NHS

   www.nhs.uk/pregnancy/finding-out/pregnant-with-twins/

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   Do identical twins come from the same egg and sperm?

   • Identical twins occur when a single fertilized egg splits into two embryos. This is a random event that occurs during the early stages of pregnancy, usually in the first week after conception. Because they come from the same egg and sperm, they share identical genetic information.

   Identical or non-identical? - Twins Trust

   twinstrust.org/information/pregnancy-and-birth/finding-out/identical-or-non-identical.html

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   What happens if you have two identical twins?

   • The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys. Non-identical (dizygotic) twins happen when 2 separate eggs are fertilised and then implant into the womb (uterus).

   Pregnant with twins - NHS

   www.nhs.uk/pregnancy/finding-out/pregnant-with-twins/

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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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   What is the difference between identical and fraternal twins?

   • The differences between identical and fraternal twins are due to how they are conceived. When identical twins are conceived, the fertilized egg splits into two, causing two separate embryos to grow. When fraternal twins are conceived, two eggs are fertilized at the same time. Factors that increase your chances of having twins include:

   Identical Twins: DNA, Conception, Statistics, and More - Verywell Health

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

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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 · Yet after centuries of societal assumptions that identical twins were well, identical — right down to genetic composition in recent times — the reality might be somewhat different than we thought.

3. 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 · Identical twins, also known as monozygotic twins, share the same egg at conception and are always either both boys or both girls. Fraternal twins, also known as dizygotic twins, come from two separate eggs fertilized at the same time. They could be the same sex or different.

4. twinstrust.org › identical-or-non-identicalIdentical or non-identical? - Twins Trust

   twinstrust.org › identical-or-non-identical

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   How are identical twins different from each other? Identical twins have the same genes and sex. However, environmental factors can lead to differences in appearance, including in height and weight. Identical twins often have different personalities, interests and preferences.

5. Videos

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     Beyond genetics: what makes identical twins different?

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     What identical twins separated at birth teach us about genetics - BBC REEL

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     Do You Have An Unrelated Identical Twin? | Full Documentary | Finding The Most Identical Strangers

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6. www.nhs.uk › pregnancy › finding-outPregnant with twins - NHS

   www.nhs.uk › pregnancy › finding-out

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   Identical (monozygotic) twins happen when a single egg (zygote) is fertilised. The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys.

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

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

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   5 days ago · 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.

8. 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.

9. www.sciencefocus.com › the-human-body › do-identicalDo identical twins have identical genes? - BBC Science Focus ...

   www.sciencefocus.com › the-human-body › do-identical

   They start with identical genes, because each is formed from a single fertilised egg that splits into two embryos. But from that moment onwards, their DNA begins diverging. The DNA replication mechanism introduces about one new mutation for every 100 million base pairs copied, per generation.