Lithochromis rubripinnis is one species of Lake Victoria cichlids. Lake Victoria cichlids are a well-known model system for the study of speciation. Although the evolution of the sex-determination system may drive speciation, sex determination is not well-analyzed in the cichlids. In this issue of PLoS Genetics, Yoshida et al. report that L. rubripinnis have a unique sex-determination system. In this species, B chromosomes have a function in sex determination. B chromosomes are additional chromosomes known as selfish genetic elements. The image shows that the female karyotype includes two B chromosomes, while the male has none.
Image Credit: Kohta Yoshida (Tokyo Institute of Technology)
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