This document discusses genetic mapping and its various medical applications. It describes how genetic mapping is used to identify the positions of genes within genomes and locate genes associated with certain traits or diseases. Specifically, it mentions two studies: one that used genetic mapping in mice to identify the pituitary tumor transforming gene's role in liver fibrosis, and another that mapped genes responsible for leaf rust resistance in wheat. The document also outlines some of genetic mapping's utility in medical fields like assessing disease predispositions, genetically engineering crop resistance, and examining fetal genetics during high-risk pregnancies.