Answer :

The human genome consists of about  3 billion chemical letters (in a sperm or egg cell).

  • The human genome has 3 billion letters, and it is still up for debate as to how many of these are actually functional.
  • There are letters that code genes, our genetic material, and there are letters that give instructions on how cells should use the genes.
  • The 23 pairs of chromosomes in cell nuclei plus a tiny DNA molecule present in each mitochondria make up the human genome, which is a full set of nucleic acid sequences for humans.
  • The nuclear genome and the mitochondrial genome are often treated separately.
  • The four DNA bases, adenine (A), cytosine (C), guanine (G), and thymine (T), are used in different ways by each gene's code to create three-letter "codons" that define which amino acid is required.

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