Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Path diagram for a model of sex limitation in a pair of DZ opposite-sex twins, using a Cholesky factor approach. Only the phenotypes P1s, additive genetic factors, A1s, and common environment factors, C1s, are shown, in which 1 refers to trait 1 and subscript s refers to the sex of the twin.
