When reading a codon of DNA. As T G C we see just three letters but when those letters become a triangle they have to go from Musical notes C to G# to B and thats fine but we must also remember to draw the final line of the triangle from B back to T. In this example all of them fit inside a 12 note circle but if we take GTT or D E G# we draw a line from D to E to G# but then from G# we have to draw a line from G# back to D but that is now is the next section of the keyboard an overlap adding C# D and D to the circle. Now you might say no it just fits within the 12 sections D back to D but the pattern begins with T or C musically and we choose a letter from each of the sections of four…….TAGC……TAGC….TAGC but in order to understand why some of the codons with a 180* aspect in them but no Tritone exists. In order to finish that last line in some of the codons we need 15 notes to choose from. Its a stretch but a possibility.
I guess the starting letter of a codon is the issue if you start with T and end on B its not a problem all are included but if in the case of GTT you start at Musical Note D but you start with the full circle so in order to end the triangle you have to go over the original start point of T and can go as far as the original four letters to D#.
It would explain why not all tritones appear in the full circle. Enjoy your thinking x
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