Elaborate on the use of CRISPR-Cas9 technology in genome editing and its implications for gene therapy and genetic research. What ethical concerns does this technology raise?

CRISPR-Cas9 is a groundbreaking technology in genomics that allows for precise editing of DNA at specific locations, enabling scientists to delete, insert, or alter sections of the DNA sequence. Its implications for gene therapy are profound, potentially allowing for the correction of genetic disorders and the customization of genetic traits before birth. However, ethical concerns include potential unintended consequences, such as off-target effects, and the broader implications of gene editing on human evolution, eugenics, and biodiversity.