Modification of Sex Differentiation by Steroid Hormones in a Tree Frog (Pseudacris nigrita triseriata Wied).

Abstract

Testosterone masculinizes the course of gonad differentiation in genetically female larvae of treefrogs. Gynogenic steroids are only partially feminizing the gonadal development of genetic males. These results establish for hylids and ranids a common reaction type to steroid treatments, which differs characteristically from that of all other amphibian families which, so far, were submitted to tests.