The correct option is 1 and 3 because understanding the arrangement of genes on chromosomes allows for tracking hereditary traits in livestock, thereby aiding in pedigree analysis and better breeding strategies. It also facilitates the development of disease-resistant animal breeds through selective breeding and genetic engineering by identifying and manipulating specific genes associated with disease resistance. However, while this knowledge aids in identifying genetic predispositions to some diseases, it does not mean that all human diseases can be fully understood or treated just based on genetic information, making statement 2 incorrect.