The Central Dogma of biology explains that DNA codes for RNA which codes for proteins which make genes.
1. The first part of Central Dogma is that DNA codes for RNA. DNA is a deoxyribonucleic acid that carries genetic information. DNA's complementary nitrogenous bases include adneine, thymine, guanine, and cytosine. When DNA is transferred into messenger RNA, adenine becomes uracil, thymine becomes adenine, and cytosine and guanine are still complementary.
2. The second aspect of Central Dogma is that RNA codes for proteins. Each sequence of three bases called a codon codes for one amino acid, which are the building blocks of proteins. mRNA gives the codons that give us the specific amino acid sequences. Transfer RNA is what assembles the protein, one amino acid at a time.
http://ghr.nlm.nih.gov/handbook/howgeneswork/makingprotein
3. Genes are expressed by being transcribed into RNA and then translated into proteins.
Protein Synthesis is one of the most basic biological processes by which single cells create specific proteins. This process includes the use of deoxyribonucleic acid and ribonucleic acids. It is initiated in the cells' nucleus, where enzymes unwind the the needed section of DNA. This makes specific portions of DNA acessible, and an RNA copy is able to be made. The RNA then moves to the cytoplasm where the rest of the process takes place. Transciption is the first true step in which the information enbedded in DNA is copied into an RNA molecule. It is then transported into the cytoplasm where it comes in contact with ribosomes-the cells assemblelr of proteins. tRNA molecule posses specific codons which code for specific amino acids, which forms proteins.