Genes are segments of DNA that determine the traits and physical characteristics of the organism. Inside a strand of DNA there are millions of genes! Genes are made up of genetic information that is carried in DNA. Genes are microscopic, but have the power to determine many very improtaint charactoristics. In the future geene tharapy may be ablt to prevent things like heard disease. For more information on DNA, see our article: DNA: Unzipped!!

Genes can be either dominant or recessive. The dominant gene is the one that will show up in the person. Genes for a person can be guessed by the genes on his or her parents. The genes can be mapped in something called a punnet square.