What is meant by , not all chromosomes are a perfect pair but 22 of them are paired perfectly

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The statement not all chromosome are a perfect pair suggests, humans have 23 pair of chromosome, out of 23 pair, 22 pair are autosomes. They control different body characters and are same in all human beings. The remaining pair i.e 23rd pair or allosome are sex chromosome and is not same in all humans. Females have a perfect pair of XX chromosome, where as male does not posses a perfect pair as the 23rd chromosome pair in males are XY.

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22 pair of chromosomes are perfect pair which is known as autosomes.Always female have perfect pair of chromosomes(xx)and male have a mismatch pair(xy).
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