The number and complexity of gene families linked with cell adhesion and cell signaling pathways has increased during many of the distinct transitions to multicellularity. Why would this be the case? Why is it unexpected that the emergence of multicellularity is frequently associated with an increase in gene families connected with cell–cell signaling?

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.