What is a gene and what is an allele?

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.

explanation:

plz give me the characteristics.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this