This section, (Part I of SLZL111) provides an overview of certain important principles and study fields of zoology. The learner is firstly introduced to the scientific principles underscoring the study of animals. This is followed by an introduction to living systems and theories on their origin. In the next section the focus is placed on the structure and function of the animal cell, reproduction of these cells and the basic principles of Mendelian genetics. The module is concluded with an introduction to principles of animal taxonomy.