Centromere Positions
Each chromosome has two arms, labeled p (the shorter of the two) and q (the longer). The p arm is named for "petit" meaning 'small'; the q arm is named q simply because it follows p in the alphabet. (According to the NCBI, "q" refers to the French word "queue" meaning 'tail'.) They can be connected in either metacentric, submetacentric, acrocentric or telocentric manner.
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“Extreme positions are not succeeded by moderate ones, but by contrary extreme positions.”
—Friedrich Nietzsche (1844–1900)