A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene. An allele refers to a specific variation of a gene.
gene is a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring and allele is one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
