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Genetics: What is the Central Dogma? (Replication, Transcription, and Translation)

Updated on June 22, 2017
Figure by Bruce Fouke (2006).
Figure by Bruce Fouke (2006). | Source

The central dogma is the core of genetics. It states that DNA is transcribed into RNA, which is translated into proteins. This is the process by which organisms are capable of synthesizing proteins necessary for life.

Summary:

(DNA --> RNA --> Proteins)

DNA Replication

DNA Replication is the process by which DNA copies itself.

Process:

  1. DNA is unwound.
  2. The strands are separated and held apart.
  3. DNA Polymerase helps in the addition of nucleotide bases (A, T, C, G) complementary to the template strand.
  4. DNA winds itself back up.

Result: 2 identical strands (assuming everything goes perfectly)

DNA and RNA

Source

Transcription

Transcription is the process by which RNA is synthesized from DNA.

Process:

  1. DNA is unwound.
  2. The strands are separated and held apart.
  3. RNA Polymerase II helps in the addition of nucleotide bases (A, U, C, G) complementary to the template DNA strand.
  4. The RNA strand separates from the DNA strand.
  5. The DNA strands come back together.
  6. DNA is rewound.

Result: RNA strand

Translation

Translation is the process by which proteins are synthesized from RNA, specifically mRNA or messenger RNA.

Process:

  1. mRNA leaves the nucleus and enters the cytoplasm.
  2. The small ribosomal subunit attaches to the mRNA.
  3. The large ribosomal subunit attaches.
  4. tRNA (transfer RNA) enters the ribosome and pairs with an mRNA codon, a group of 3 nucleotide bases (tRNA contains an anticodon and an amino acid specific to its anticodon).
  5. As the mRNA moves through the ribosome, the tRNA shifts over, and another tRNA is added.
  6. When the mRNA continues, the amino acids are added together to form a polypeptide chain.
  7. When the sequence is terminated, the polypeptide chain is released.
  8. The polypeptide chain folds into a protein.

Result: Protein

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    • Haballa profile image

      Andrew Aballa 5 years ago from Kisumu, Kenya

      Brilliant hub. Covered the topic well

    • eternals3ptember profile image

      Col. Duke LaCross (...Okay, maybe I lied) 5 years ago from Sherman Oaks (Not the Nice Part, Unfortunantly)

      I wish I had this when I took bio

    • ccornblatt profile image
      Author

      Cassidy Cornblatt 5 years ago

      Thanks guys. I'm glad the information comes across well.

    • Seeker7 profile image

      Helen Murphy Howell 5 years ago from Fife, Scotland

      This was so fascinating and I wish they had taught us like this years ago in nursing school!! Voted up!

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