Each chapter begins with an overview of the key concepts to be discussed, in this case the cellular basis of inheritance. The chapter then presents a series of figures illustrating these concepts. It explores how organisms develop from fertilized eggs through cell division, the life cycles of animals, fungi and plants, the processes of crossing over and independent assortment during meiosis, the stages and outcomes of meiosis and mitosis, examples of genetic disorders caused by nondisjunction during meiosis, and different types of chromosomal rearrangements like inversions and translocations.