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How many pairs of sex chromosomes are contained by the human beings ? Explain how is sex determined in a human child ?

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How many pairs of sex chromosomes are contained by the human beings ? Explain how is sex determined in a human child ? 

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In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females.

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