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. Genes are located on the chromosomes . A pair of chromosomes contains pairs of genes. One gene of each pair is on one chromosome and the other gene is on the matching chromosome.