Answer: B:the science of heredity
Explanation: Genetics is the study of genes, differences among genes (genetic variation) and how these genes are passed on from parents to offsprings (heredity). A gene is a segment of a DNA that carries genetic information and controls certain hereditary traits. Genes are hereditary factors that produce observable traits. Heredity is the study of the passage of traits or characteristics from parents to offsprings. For example, observable traits such as eye colour and height are inherited from the parents by the offsprings at the point of fertilization.
