RNA works together with DNA to regulate a cell. Like DNA, RNA controls cells through the making of proteins. Inside the nucleus, a copy of the DNA code is made like a blueprint in the form of RNA mulecules. The RNA molecules leave the nucleus and enter the cytoplasm. They are messengers that carry information from the DNA to the ribosomes.
Ribosomes work like assembly lines that make enzymes and other cell proteins.
Gene A gene is the unit of inheritance that is passed from parents to offspring. For each trait, there are at least two genes that control its inheritance. Genes occur in pairs on chromosomes inside the nucleus of a cell. There are dominant genes for dominant traits and recessive genes for recessive traits. A dominant gene may mask a recessive gene when the genes are paired.