The crossword solution for the term 'Bit of Inheritance' is GENE (4 letters). A GENE is a unit of heredity that is passed from parent to offspring and is held to determine some characteristic of the offspring. Genes are made up of DNA and are located on chromosomes in the cell nucleus. Genes are responsible for passing down traits such as eye color, hair color, and other physical characteristics. They can also be responsible for passing down diseases and disorders.