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twin
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twin

One of two young produced from a single pregnancy. Human twins may be genetically identical (monozygotic), having been formed from a single fertilized egg that splits into two cells, both of which became implanted. Nonidentical (fraternal or dizygotic) twins are formed when two eggs are fertilized at the same time.

In the US there has been a 52% increase in the number of twin births in the period 1980–97.



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? Mentioned in ? References in periodicals archive
 
Interestingly, in patients younger than 50, concordance was dramatically different between monozygotic twins (where four of four twin pairs were concordant) and dizygotic twins (where only 2 of 12 twin pairs were concordant).
Accelerating research on genes and environment in Parkinson's disease by Langston, J. William / Environmental Health Perspectives
Twin studies show a higher concordance among monozygotic twins (85%) than among dizygotic twins (21%).
Atopic dermatitis by Barnes, Cheryl J. / Southern Medical Journal
Like dizygotic twins, ordinary siblings also share approximately half of their genes; genetically, dizygotic twins are ordinary siblings.
True Nature: A Theory of Sexual Attraction. (Book reviews: is half an ... by Bem, Daryl / The Journal of Sex Research
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