A genome is a genetic material that makes up a living organism. It is contained in chromosomes, which are the tiny threadlike structures inside cells.
Chromosomes are made from a chemical substance called DNA, and DNA is a sequence of smaller units, called bases.
The DNA bases combine to form genes. These contain the instructions that are passed on from one generation of an organism to the next.
The Human Genome Project was an international effort to discover the exact makeup of the genetic material that controls the way human beings develop, and grow.
Thousands of scientists from many countries worked on the Human Genome Project.
The first draft of the human genome was published in 2000, and a more complete version was published in 2003.