Monday, February 6, 2023

Tag: reared-apart twins

Exploding the “Separated-at-Birth” Twin Study Myth

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Supporters of the nature (genetic) side of the “nature versus nurture” debate often cite studies of “reared-apart” or “separated” MZ twin pairs (identical, monozygotic) in support of their positions. In this article I present evidence that, in fact, most studied pairs of this type do not qualify as reared-apart or separated twins.

“Three Identical Strangers” and the Nature-Nurture Debate

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Three Identical Strangers is a riveting film describing the story of identical triplets separated at six months of age and reunited in early adulthood. Their story provides no evidence in support of the genetic side of the nature-nurture debate, but it does supply some evidence in favor of the environment.

Bad-Science Warning: The “Minnesota Study of Twins Reared Apart” (MISTRA)

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The huge impact of the MISTRA, in addition to the harmful and regressive social and political policy implications that flow from it, necessitates a detailed analysis of the “science” behind the study’s major claims and conclusions. Here I offer a new critique of this famous and influential “separated twin study.”

Schizophrenia Twin Research as Reported in The Gene: An Intimate History...

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In his 2016 book The Gene: An Intimate History, cancer physician and researcher Siddhartha Mukherjee chronicled the initial idea of the gene, taking readers through the history of genetics up to the current “post-genome” period by interweaving science, social history, and his own personal narrative. In the process he documented some of the crimes of the eugenics movement and the monstrous atrocities committed by German National Socialism in the name of eugenics and biology, while noting the Nazi’s promotion of twin research. He also criticized aspects of intelligence testing and genetic theories of racial inferiority based on IQ tests. At the same time, Mukherjee supported and promoted many contemporary behavioral genetics positions.

Twin Method Assumptions are Indefensible, but are Useful to the Rich...

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The wealthy, and the institutions they finance and promote, look favorably upon research whose authors claim that economic disparities are rooted in biology, and are not harmful to humanity as a whole. But there are countless obvious real-world examples showing that political policies, social struggles, and public health programs, including those involving the adjustment of income differences, lead to improved health and well-being.