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a-globin 850 base pairs but 141 amino acids HELP PLEASE watch

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    is anybody able to help me answer/understand this question below?
    This is an A-level type question we have been given and I am completely lost.

    Explain the following statement in terms of your knowledge of the structure and function of DNA:
    'The DNA which codes for the human protein, a-globin, has 850 base pairs but there are only 141 amino acids in this protein'.

    Thank you so much in advance
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    Each amino acid is coded for by three bases arranged in a codon, so that reduces the number from 850 to about 284.

    Can't really remember the rest so i'll make it up a bit and hope for the best.

    There are codons that do not code for an amino acid, so that reduces the number somewhat.

    DNA is degenerate so an amino acid can be coded for by more than one codon.
 
 
 
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