Personalized medicine, precision medicine, or genomic medicine, regardless of the name, is focused on tailoring health care to individual preferences, lifestyle, environment, and genetic variability. This approach aims to treat the whole person based on their differences from other patients rather than focusing on similarities in pathology and symptoms. The move toward personalized medicine has escalated in recent years due to accelerations in technologic advances and informatics and increased knowledge of individual genetic and genomic variability. Nurses are at the forefront of this movement, as we have always treated individuals rather than diseases and symptoms. The number of nurse-driven research projects that include genetic or genomic data is increasing exponentially with a focus on translation to the patient. As precision medicine becomes a reality, genetic and genomic concepts will be relevant not only to nurse researchers but also to educators and clinicians at all levels. The goal of the Primer in Genetics and Genomics (PGG) series that ends with the current issue of Biological Research for Nursing (BRN) was to educate all nurses on genetic, genomic, and epigenetic concepts relevant to nursing science and practice. The PGG series was conceived through collaboration between leadership of the International Society of Nurses in Genetics (ISONG) and the BRN editorial staff. As the guest editor for this series, I solicited articles from ISONG members actively conducting genetic or genomic research, working in genetic clinics, and teaching genetic and genomic concepts in nursing schools. Ultimately, we published seven articles covering the basics of genetics, genomics, and epigenetics with a focus on educating nurses. The first article in the series, "DNA, Genes, and Chromosomes," explains the basic scientific tenets of gene transcription and translation and genetic and epigenetic mechanisms of variability including a historical review of how the science has developed in these areas (Dorman, Schmella, & Wesmiller, 2016). The article defines deoxyribonucleic acid (DNA) and chromosomes and clarifies the relationships among DNA, genes, and chromosomes. A table of online genomics resources is included in this article to support future learning needs of readers. This initial article is an important resource for beginning nurse scientists, nursing students and faculty at all levels, and especially for the practicing nurse who may not have had previous exposure to the basics of genetics, genomics, and epigenetics.