Sexual determination and differentiation work in myriad ways across the animal kingdom. In vertebrates, like mammals and fish, sexual determination leads to the development of either ovaries or testis. These organs then secrete hormones that go on to govern the sexual development of the rest of the organism’s body. Insects are a completely different beast.
In a study appearing in Science, Assistant Professor Celina Juliano, Department of Molecular and Cellular Biology, and her colleagues used single-cell sequencing techniques to explore the genetic trajectory for nearly 25,000 cells of the immortal Hydra.