Before revision: A growing cell population such as cancer or bacteria accumulates point mutations (single nucleotide changes in DNA). To model this process, we consider that cellsdivide and die as a branching process, and that each cell contains a sequence of nucleotides which can mutate at cell division.
After revision: We study a fundamental model of DNA evolution in a growing population of cells: cell divisions follow the Yule process, and that each cell contains a sequence of nucleotides which can mutate at cell division.