Inheritance of Shoulder Spotting in the Tetra, Hyphessobrycon bentosi Characidae

Jack S. Frankel*
Department of Biology, Howard University, Washington, DC, 20059, USA

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© 2009 Jack S. Frankel

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Biology, Howard University, Washington, DC, 20059, USA; Tel: 202-806-6959; Fax: 202-806-4564; E-mail:


The tetra (Hyphessobrycon bentosi) exhibits two phenotypes associated with shoulder spotting. Fish possess either a prominent black vertical spot located directly behind the operculum (H. b. bentosi, bentosi white tip tetra) or lack this spot (H. b. rosaceus, rosy tetra). Segregation patterns observed from the progenies of ten different crosses suggest that the inheritance of these phenotypes is controlled by two autosomal loci acting in a complementary fashion, with dominance at both loci required for the expression of the spotted phenotype.