Scientists can use research on the human genome to help look for cures and treatments to diseases.
For example, many scientists are using research on the human genome in an effort to cure cancer. Scientists can compare the sequences of a healthy genome and a cancer genome (which is basically a human genome that reproduces indefinitely) to find the differences between the two. They can use the differences in these sequences to look for cures for cancer.
Google "Human Genome Project" or "Cancer Genome Project" if you are interested in learning more.