Talk:Minnesota Twin Family Study

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"Twins are valuable to researchers because they share 100% of genes in identical twins and 50% of genes in fraternal twins."

The first part of this is true (except in very rare cases, like if one twin has Turner's syndrome), but as far as I know there's no specific amount of DNA shared by all fraternal twins. They can have as much or as little in common as any other siblings, as genetically speaking, they're just siblings who happened to gestate together.

Speaking off-hand, I believe 50% is considered the average amount that any non-identical siblings share.--Nectar 10:43, 25 February 2006 (UTC)

The link "Sources of human psychological differences: the Minnesota study of twins reared apart." to http://www.mugu.com/cgi-bin/Upstream/Issues/psychology/IQ/bouchard-twins.html is broken. 24.118.202.109 12:32, 20 April 2007 (UTC)