Fig. 3

Evolutionary topologies of gametologs. Maximum likelihood phylogenies with bootstrap support values showing: a Monophyletic (e.g., DDX3Y) and (b-c) Polyphyletic (e.g., AMELY; STSY) patterns of evolution, with AMELY being broadly polyphyletic and STSY polyphyletic with two separate origins; Y orthologs in different species are highlighted with colored boxes