Children born from the same pregnancy. Twins can result from either a single zygote (monozygotic, or identical twins) or from two, separately-fertilized egg cells (dizygotic, or fraternal twins).

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Phenotype choice for one of a MZ twin pair in a genetic association study

I was having a discussion with a colleague and this question came up... It is commonplace in molecular genetics studies to only genotype one of a pair of monozygotic twins (and then implicitly impute ...
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Is “Cisternal Twins” an actual classification of twin types and if so, describe it

I always assumed my brother and I were identical twins. Now my mother, in her eighties, says we are cisternal twins, but I cannot find any references on the matter. Is there such a thing? If so, what ...
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Can a woman give birth to twins with different fathers?

Is it possible for a woman to conceive from two different men and give birth to half-siblings?
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The gender of offspring of Twins?

Given identical twin males, Michael and Douglas, Douglas and his wife have four children, all of whom are girls. Michael and his wife have only one child, a boy, and are expecting another. What are ...
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Do identical twins have the same fingerprint?

When there is every thing same from their genes to their phenotype so then why they don't have same fingerprints?
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Limb polarity such as writing handedness, golf handedness and natural football foot

Define the term "limb polarity" to mean things such as writing handedness, golf handedness, throwing ball arm preference and natural boxing hand. I avoid using the term "handedness" because of its ...
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Is a double-yolk egg capable of producing two viable chicks?

As per title: If fertilized, is a double-yolk egg capable of producing two viable chicks (that could survive to adulthood)? Have there been any reported cases of such (presumably) fraternal twins?
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Identical twins' biological sexes

Can identical twins have different genders (as in biological sex)? I thought they should have absolutely the same genes. If they can, what caused it? I'd assume it MAY be because of errors in ...
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Which disorders are fully concordant?

I work in neuroscience, mostly Alzheimer's disease (AD), with some work in autism spectrum disorder (ASD). The work is in gene regulation and epigenomics. I'm familiar with monozygotic twin (MZ) ...
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Is there a limit to twinning?

Can developing twins further divide and subdivide and become identical quadruplets or octuplets or...? Can twinning be induced, either in utero or in vitro? Might it be possible to just keep ...
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When does identical twinning happen?

What is the window during which division into twins is possible (for instance can it still happen after implantation in the uterus)? Is one twin the "original" and the other its clone?
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Are identical twins exactly the same?

http://www.scientificamerican.com/article.cfm?id=identical-twins-genes-are-not-identical According to this article some identical twins show differences with respect to their copy number variants. ...