The human genome - the complete set of human genes - comes packaged in twenty-three separate pairs of chromosomes. Of these, twenty-two pairs are numbered in approximate order of size, from the largest (number 1) to the smallest (number 22), while the remaining pair consists of the sex chromosomes: two large x chromosomes in women, one x and one small Y in men. In size, the x comes between chromosomes 7 and 8, whereas the Y is the smallest.
-Genome The Autobiography of A Species In 23 Chapters by Matt Ridley
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