ABSTRACT
The genome sequencing that is at the forefront of conversations about genetics these days is both different from and similar to traditional genetic testing. Today, millions of people are participating in research projects to sequence genomes and assess the utility of knowing the 3-billion-unit order of A, C, T, and G. Some genome projects have participants who share a medical condition, such as heart disease or autism. Others are following healthy people, to see if anything in their genomes predicts disease. The introduction to Chapter 3 describes three such programmes.
