It is also interesting that many, perhaps most, patients with this condition also have skin allergies, eczema and/or asthma. The patient with moderate to severe icthyosis often has problems sweating due to the buildup of scales on the skin. The scales essentially seal the sweat glands.
For now, it is good to know the names. These names apply to all major and minor scales. 1  1st-Tonic. 2  2nd-Supertonic. 3  3rd-Mediant. 4  4th-Subdominant. 5  5th-Dominant. 6  6th-Submediant. 7  7th-Leading Tone.
The D major chord I is the D major chord, and contains the notes D, F#, and A. This tonic chord's root / starting note is the 1st note (or scale degree) of the D major scale. The roman numeral for number 1 is 'I' and is used to indicate this is the 1st triad chord in the scale.