This project focuses on virtually sequencing mitochondrial DNA, utilizing a template isolated from Homo sapiens neanderthalensis. Initial sequences are generated via a sequencing simulator, followed by assembly using the Velvet sequence assembler. Dot plots, generated by Dotter, serve as a crucial analytical tool for assessing the impact of different sequencing parameters on assembly quality. Furthermore, BioAWK, a specialized version of AWK tailored for biological data analysis, is employed for efficient manipulation and analysis of DNA sequences. Alongside, data visualization is conducted using R. The seamless integration of shell programming streamlines the execution of various tasks and tools. By leveraging these tools synergistically, this project aims to deepen understanding of DNA read handling, sequencing methodologies, and optimizing assembly processes. All files from this chapter are available from the book’s GitHub repository at CompBiol3/20_Sequencing .