A gene is a heritable factor that consists of a length of DNA and influences a specific characteristic.
A gene occupies a specific position on a chromosome.
The various specific forms of a gene are alleles.
Alleles differ from each other by one or only a few bases.
New alleles are formed by mutation.
The genome is the whole of the genetic information of an organism.
The entire base sequence of human genes was sequenced in the Human Genome Project