Vertebrate sexual systems

Awesome figure of the sexual systems used by 2,145 vertebrates species (705 fish, 173 amphibian, 593 non-avian reptilian, 195 avian, 479 mammalian).Similar figures for plants and invertebrates. Tree structure is derived from taxonomy, where each tip represents all species in a single genus. Diploid chromosome number is indicated by the height of the innermost ring. …

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Pragmatic definitions in biology

Biology is littered with concepts that biologists cannot always agree on how to define or where there are special cases where the common definition have to be amended. Species. Complexity. Modularity. Evolvability. Evolution. Genes. Community. Robustness. Open-ended evolution. Fitness. Life. Take species. The current state of affairs is that there are many different definitions, and …

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