The basic physical and functional unit of heredity is called _____?

1. Chromosome
2. Gene
3. Cell
4. None of these

A gene is the basic physical and functional unit of heredity. Genes are made up of DNA and act as instructions to make molecules called proteins. They are the segments of DNA that are passed from parents to offspring and determine specific traits. Chromosomes are structures that carry genes, and cells are the basic units of life.