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The Geometry of Multicellular Life

One of the most fundamental issues in evolutionary biology is how unicellular life transitioned to multicellular life. How — and why — was it that the simplest single-celled organisms that emerged from the primordial soup evolved into organisms with many cells and cell types dividing up life鈥檚 processes? In this seminar, I will describe recent experimental and theoretical advances in understanding the architecture of organisms that serve as models of this evolutionary transition. These include the shape-shifting properties of certain choanoflagellates (the closest living relatives of animals), the recent discovery of common probability distributions of cellular neighbourhood volumes in yeast and alga, and embryonic 鈥榠nversion鈥� and the spontaneous curling of the extracellular matrix of green algae. These studies together shed light on the fundamental question, 鈥淗ow do cells produce structures external to themselves in an accurate and robust manner?鈥�