Figure 1From: Are homologies in vertebrate sex determination due to shared ancestry or to limited options?Phylogeny and sex-determination systems in vertebrates. (a) Tetrapods; (b) teleost fishes. The different sex-determination systems found in the different lineages are indicated on the right of the figure. For the fish lineages (b), homologies of identified sex chromosomes to the ancestral teleost karyotype (TEL) are shown [67]. See Table 2 for details.Back to article page