Can you have a pattern without repetition? Yes, repetition is more common than patterns.

No, pattern and repetition are exactly the same.

No, there must be some repetition to create the pattern.

Yes, a pattern can occur only once while repetition cannot.

Patterns are simply a repetition of more than one design element working in concert with each other. A seamless pattern is one where every element within a design (no matter how often it's repeated) combines to form a whole.

yes that is correct and good

explanation:

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !