You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Dark Pigment Variants in Anurans: Classification, New Descriptions, Color Changes and Inheritance
Christina M. Richards and George W. Nace
Vol. 1983, No. 4 (Dec. 14, 1983), pp. 979-990
Stable URL: http://www.jstor.org/stable/1445100
Page Count: 12
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Dark pigment variants are described in four species of frogs, Rana pipiens, R. clamitans, R. sylvatica and Ptychadena mascareniensis. Guidelines are proposed for recognition and description of dark variants by field collectors. A classification scheme is proposed to categorize the many phenotypic types seen among dark frogs. Breeding experiments demonstrated that the dark gene was sometimes expressed in the heterozygous condition making it a dominant gene but that penetrance was so low that in most instances it appeared to act as a recessive. Color change sometimes occurred in captive dark frogs. These were always increases in normal pigmentation rather than of dark pigmentation.