Tuesday, September 22, 2009
Genes May Explain Why Children Who Live Without Dads Have Earlier Sex:
Mendle and her colleagues looked at more than 1,000 cousins ages 14 and older from the National Longitudinal Survey of Youth. The study design tested for genetic influences as well as factors such as poverty, educational opportunities, and religion. It compared children who were related in different ways to each other, and who differed in whether they'd lived with their fathers. The more genes the children shared, the more similar their ages of first intercourse-regardless of whether or not the children personally had an absent father. This finding, the researchers say, suggests that environmental theories don't fully explain the puzzle. Instead, genetic influence can help us understand the tie between fathers' absence and early sex. This issue is known to anyone who has read Judith Rich Harris' The Nurture Assumption. Nevertheless a lot of the psychological and social research published today routinely ignores the possibility of passive gene-environment correlation from what I can tell. Of course heritable propensities express themselves in an environmental context, so for example the rank order of average age of first intercourse among a set of unrelated families may remain the same in a Mormon "treatment" as opposed to a Wicca treatment (this is a thought experiment obviously), but the average age for the two cases would probably differ somewhat. Labels: Behavior Genetics |