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A comment on The morality of sperm donation. Parent comment

Re:The morality of sperm donation by manmal on Tuesday February 19, 2013 @04:23AM (#5243426)
Do these twins grow up in comparable environments? Another thing to consider: gene expression and brain development is kicked off in the womb, and twins most often share the same mother. I'm not sure your argument applies here.
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Re:The morality of sperm donation by pygy_ on Tuesday February 19, 2013 @05:12AM (#5243550)
That's the point of twin studies: comparing genetically identical subjects who grew up in different environments.

The prenatal influence cannot, practically, be investigated at this point in history.

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Re:The morality of sperm donation by Daniel_Newby on Tuesday February 19, 2013 @06:55AM (#5243821)
The prenatal influence has been directly tested. They compare pairs of non-identical siblings, some who are twins and some who are not. The same pregnancy pairs are about as similar to each other as the other pairs. So the prenatal environment either has little effect, or it has a significant but highly nonlinear effect. (Once again, this assumes no extreme hardship.)
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Re:The morality of sperm donation by pygy_ on Tuesday February 19, 2013 @08:01AM (#5244003)
Interesting, thanks.
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Re:The morality of sperm donation by Daniel_Newby on Tuesday February 19, 2013 @06:49AM (#5243804)
Some of the studies use twins raised in the same household, some use twins adopted by different families. They get very similar results.
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