Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.


Aryan Brazilian twins aren't that exciting

Gene ExpressionBy Razib KhanFebruary 26, 2009 2:38 AM


Sign up for our email newsletter for the latest science news

A few days ago I mentioned that the story about a bumper crop of twins in a German town in southern Brazil was notable because of the elevated frequency of identical, not fraternal, twins. A reader points out that that was an error, and The New York Times has appended a correction:

The Cândido Godói Journal article on Monday, about the unexplained proliferation of twins born in the farming town of Cândido Godói in southern Brazil, misstated the type of twins usually associated with a genetic tendency of the mother. They are fraternal twins -- like a majority of those born in the town. They are not identical twins, which are generally believed to be conceived by chance.

As I noted before, variation between populations and due to environmental inputs that affect twinning rates affect the rate of fraternal, not identical, twins. Inbreeding* or some environmental parameter, or a combination, probably explain this then. * Since twinning is somewhat heritable, the alleles which modulate twinning rates could have increased in frequency in an inbred population through drift.

    3 Free Articles Left

    Want it all? Get unlimited access when you subscribe.


    Already a subscriber? Register or Log In

    Want unlimited access?

    Subscribe today and save 70%


    Already a subscriber? Register or Log In