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The power of twin designs arises from the fact that twins may be either identical (monozygotic (MZ), i.e. developing from a single fertilized egg and therefore sharing all of their polymorphic alleles) or fraternal (dizygotic (DZ), i.e. developing from two fertilized eggs and therefore sharing on average 50% of their alleles, the same level of genetic similarity found in non-twin siblings).
Quite a few identical twins—as well as friends and family of twins—shared their stories, so if you’re curious about the differences they described, scroll down to find them on the list below. #1
The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
There is evidence of heritability in personality traits. For example, one study found that approximately half of personality differences in high-school aged fraternal and identical twins were due to genetic variation - and another study suggests that no one personality trait is more heritable than another. [6] [8]
Fraternal twins develop from two different eggs by two different sperm -- so they can often look slightly different. Although some, like Mary Kate and Ashley Olsen, end up looking so much alike ...
Identical twins Marielle and Mireille Landry met their birth mother by chance at a photo booth at the mall. It led to an amazing relationship. Twins were placed for adoption.
Jay McGuiness, identical twin brother; Gene McKinney, twin brother; Victor A. McKusick, twin brother; Alanis Morissette, twin brother; Alma Miettinen, twin sister; Burt Munro, twin sister died at birth; Olly Murs, fraternal twin brother; Mandy Musgrave, identical twin sister; Maye Musk, identical twin sister; Gaute Ormåsen, fraternal twin brother
Twenty-three sets of twins have graduated from a Massachusetts middle school, making up about 10% of the eighth-grade class. The school gave a special shout-out to the 23 sets of twins during the ...